How to Clean | Recycle | Reuse IPA (Isopropyl Alcohol) for 3D printing by VOGMAN
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- เผยแพร่เมื่อ 4 ก.พ. 2021
- I do a lot of 3D resin printing and get through plenty of Isopropyl Alcohol (IPA) when cleaning prints. To reduce expense, I clean, recycle and reuse my IPA extending its working life and saving money. It's easy to do and works very well.
For a while I've been thinking about cleaning IPA through distillation, but it's a very dangerous experiment which I discuss here. Remember, with everything done, my recommendation for distillation was clear - don't do it. Even though we're refining an existing, non-consumable alcohol here, the distilling of alcohol is often a legal grey area and that's for a good reason... it's a very dangerous process. Ignore silly claims like 'the government only wants its tax,' boiling alcohols are highly reactive and very flammable. Recycle by filtering, yes, but leave distillation to the professionals. Your health and wellbeing are worth far more than the price of a bottle of IPA, so don't take the risk.
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** SAFETY **
Don't place your IPA in direct sunlight. There's plenty of UV even in shaded areas. IPA boils at a surprisingly low temperature so avoid heat sources. Ensure containers are well marked 'do not drink' and store away from innocent hands. As for distillation, this is best left to experienced professionals as should be avoided by well meaning amateurs.
** DISCLAIMER **
This video is for and educational and entertainment purposes. The distillation experiment here involved refining existing Isopropyl Alcohol which is NOT for human consumption. Don't take risks with your health! It is a VERY dangerous. Do not try and replicate what you see here without proper equipment, safety gear and a thorough understanding of the legalities and processes involved.
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For general safety - you need cooling on the exit tube to minimize the vapor from the IPA, and as a general tip, the reviving flask can be primed with pure IPA and hose kept down submerged so the vapors have to go trough the liquid. Also, maybe a ice bath for the receiving flask.
Nice tips, thanks 😁
As a chemist, I love this video. But it's really dangerous; I've seen these distillation flash explode leaving glad imbedded in walls 10ft away; resin volitile compounds in the air is a serious health hazard. If you do this, it should be outdoor it will ventilated room and wear face shield
Trust me Paul, I'm on your side. It genuinely wasn't worth it and I hope I got that message across 😀
Next thing you know, he will create a distillation channel.
Was just about to add something about the need for active water cooled jacketed output tube to improve yield/reduce explosive atmosphere build up, but see it's been done well already.
Your funnel was the first non-test model I printed on my new FDM printer!
I wanted to add here for others considering it, it ALSO doubles as a fantastic funnel to hold your paint filters when you put your resin back in the bottle. I was having trouble with funnels clogging before and spilling resin, this one is perfect and it is FAST because it allows more of the filters surface area to be effective.
I printed mine at 150% and that seems to be the perfect size to accommodate paint and coffee filters.
Usually after every cleaning I put the bucket inside the curing station and let it cure for half an hour so that way it cures and settles at the bottom then I use a contraption I made that works alot like a French press to keep it all at the bottom for the next cleaning. Keeps my prints from getting uncured resin on them even when the alcohol is well used and I can clean it way less often
A final filtration through an activated charcoal media should help clean the IPA even more
Great video! I've always done my "rough" filter through just regular paper towels, works a treat and is basically free!
Great idea with the holey funnel!
That's good thinking... it's cheap and readily available 😁👍👍👍
I know it's good, but I don't think we can elevate it to holy status ; )
3:00min in and I’ve been smiling. Great designed funnel..
it’s trick how much you’ve embraced 3d modelling.
Strength to strength too ya.🤜🏼🤛🏼🇦🇺🍀🍀🍀🤓😎
Glad you enjoyed it. Thanks Steve 😁😁😁
The funnel idea with all those holes was BRILLIANT. Wow, seriosly, I've been filtering things for years with my filters clogingging up constantly and nothing like that has ever ocurred to me. To increase the speed of the distilation you could ad boling chips (small pieces os glass, to act as nucleation points) to the flask where you heat the alcohol. Also consider cooling the hose to maximize the the condensation of the alcohol and limit loses.You could consider investing in a distillation apparatus, but, as you have stated, at the end of the day distilling large quantities of alcohol at home isn't very pracrical and can be very dangerous. Great video as usual.
Boling chips... you live and learn 😁
Thanks for the tip.
also since you have a vaccum flask and a vaccum pump you can use a paper or a chemustry filter to vastly speed up the cleaning process, also we need a reusing IPA series ( now that i think about it this channel is more like nile red) @VOG
Nile Red? Did he know Miss Randall too?
@@vogman nope
It felt like I was watching an online chemistry class but better. I didnt fall asleep! Thanks for the tip!
I never fell asleep watching Miss Randall... though I don't remember the lessons very much 😁😁😁
That funnel is genius, I mean really. This is what I love about 3d printers. You can print things to help the printing process. One of the few machines that can build itself. A slight exaggeration but pretty close.
Some day we'll be able to 3D print 3D printers. Going to be amazing xD
Ah, Ms Phillips! Not the only reason I had a love science; I’ve always loved it and worked in Healthcare Science for 25 years, but she certainly made classes a whole lot better. 😊
Very cool idea on the paper funnel, i’ve been UV curing out my wash for a while, but didn’t think to do a fine filter, eventually I’ve gone to a double bath system, pre-wash in recycled then final wash in fresh stuff. Cheers for sharing mate
I do the same 😁
I use recycled in the wash & cure, then swill in a jar with fresh. Works a treat.
I have been thinking about that for a while now. Good to know it is effective.
Have you considered putting the bottle through a long UV cure cycle in the cure and clean?
I am thinking about this now, leaving the bottles on sun is long time run. Have you tried putting the bottle in the wash/cure machine?
Sometimes the resin bonds with the liquid during the cure cycle and forms a mucus like substance
@@CloroxThePotatoPriestyep... This happened to me today...
I tried that coffee filter thing last year and the issue with the filter clogging was a real pain. I then thought of getting a vakkuum filtering flask or making a dual stage filtering box (never did it though). Still think the filtering box with two stages of filtering is the best way to go (will tackle that project after my current).
The filter & funnel looks like a great idea!
I've actually come to find that while IPA is pretty commonly used, it is really not that great compared to other readily available cleaning supplies out there. I've found that Mr.Clean works way better than IPA, and is considerably cheaper with less odor than IPA. It cleans uncured resin off way better than IPA at a fraction of the cost. So do things like Simple Green and Mean Green cleaners. A simple rince in water or IPA after and you are good to go, but I never actually clean my parts in IPA anymore. Once you see the difference when using something else, you will never go back.
Just so happens, I have many unused (and won't be used) coffee filters. I was just thinking of this process. . . and your video magically showed up. I'm pretty sure its the algorithm. I may very well try this out. Thanks for the tip my friend.
AMAZING! I was wondering if this was possible.. couldnt have come at a better time! thanks :)
Glad I could help!
I have to say. After a lot of failed attempts to recycle IPA (I even tried the aluminum sulfate method shown on another channel and ended up with yellowish IPA which didn’t clean my prints at all).
I decided to give the distillation method a try but I used an electrical water distiller for the job.
It works perfectly, it’s safer than the “glass chemist stuff” and perfectly clean sIPA and it works over and over again. It takes about three hours to distill four liters.
As long as I take all the precautions (doing it in a WELL ventilated area and no sparks or flames of any kind around) it’s wonderful. As my wash and cure machine uses 9 liters , four distillations of the same batch of IPA pays the machine. I only need to add some cooling to the exit hose to make distilling more efficient.
I know IPA is quite cheap but I’d rather use it as much as I can in order to avoid the hassle of properly discarding it.
That filtering funnel is genius!
Many thanks 😁
This video is a masterpiece lol well done mate
Thanks Zach 😁😁😁😁😁😁
Great funnel design. Wouldn't making the side angle shallower be the way to go, otherwise you'll still end up with the same problem of most of the weight of the IPA going directly on the centre bit because it's the deepest and carries the most weight at any one time?
I cannot, cannot suffer the chaos of the intermission, it is too much!!! ty for the video it has been super useful
How do I subscribe to you like 9 times? Just one isn't enough - amazingly informative and enjoyable.
Many thanks 😁
Theres also your work flow to consider, when the ipa has reached that sticky stage where it no longer cleans all the residue from a fresh print its still suitable for an initial rinse. This both gets more use out of the old stuff AND helps preserve the new stuff since its only effectively removing the slight residue of the initial bath.
For mimimal labor you could have a second wash stayion staged up amd ready to go, or the cheap route is a bucket of old ipa that you swish the print around in before moving on to your typical cleaning rig.
The old ipa can probably be quite nasty before it becomes more trouble than its worth.
I use a large mouth container with the soft brush and "dirty" tank. I rinse via a mister and spray bottle tho depending on the size of the print. Only ipa is added to the container from the initial 10% fill is from the spray bottles. Keeps tanks of flammable liquids down for smaller scale printers. I run a d2, so build volume it works well enough for me. A mighty 8k you deff need that second tank lmao.
edit: hot tip for saving on glove, buy those cheap kitchen ones and wash your gloved hands in the tank and rinse them with a mister and dry with a paper towel.
Great video! When I leave my gooey IPA outside in the winter, the precipitation part takes less than an hour for the IPA to get to a clean state...One of the only perks of winter.
Interesting... maybe a refrigerator or freezer might do the same.
@@vogman Now that's a video idea. :)
have you thought of using an fmd printer heated bed as the controllable heat source for the distillation
you scared the hell out of me with your boiling of pure alcohol, how you did not flatten your house is a wonder, the proper way to do it is to add some RO water to the alcohol to bring down the flash point, then use a proper temp controlled heating bowl, and as alcohol evaporates at 79 deg, you only get alcohol not water as water boils at 100, please don't scare me again, and thanks for your videos really helpful to a novice just bought the halot mage pro and the UW 02 washer curing your videos are a great help, thanks
You absolute mad lad! That distilling process took some real courage to attempt. I hadn't ever considered that as an option and I'm surprised with the results. I'll buy more IPA off the shelf to save myself the danger, but I like where your head is at. PS, I'll be ordering that funnel now. I have 2 tanks of IPA that need to be filtered and I just keep putting it off because the funneling takes sooooo long. You solved that for me! Cheers buddy.
Madness runs in the family blood... gibber gibber.
A procy saftey option is an inert atmosphere
A chemist I'm clearly not 😁😁😁
I like that filter!
Thanks Jesse 😁
Brilliant funnel VOG. I use a filter sock. They are used in fish tanks and can be washed and re used. Make sure you get the finest one. It took a bit of searching.
I really should have thought of that Tony. I used to filter Veg Oil in the same way before I moved on the settling 😁👍👍
@@vogman It would be a perfect match for your funnel.
Potential distillation setup improvement. In place of using torch to heat up the water bath, maybe you can try using W1209WK controller (the same as in printer internal heater) with the electric heater. This way you could quite precisely control the temperature over time, compensating even water evaporation to some degree. This should even reduce even a "little bit" a risk of vapor to blow off with not having open fire.
Totally pleased =).
Then so am I 😁😁😁
If you have a chest freezer, (one you would not mind drilling a hole into) it would be interesting to see if a cold trap could be used to condense IPA vapor only using ambient heat for distillation. Maybe even use heat off of the compressor?
Super cool channel.
Cool idea!
Finally someone similar. Although I make technical models, I'm more of a detailer. So I distill the IPA after each filtration. :-D I just have a closed circuit. It can't be felt and I was thinking of heating it up with my CPU. :D
Your channel is great!
Thank you very much! 😁😁😁
I saw at the beginning of the video that you had a wash and cure machine - would it be safe to speed up the process of windowsill curing the cloudy IPA by using the cure function of the machine? Thanks in advance!
If you use an electric stovetop to heat your water bath on low heat and then a chilled collection vessel (ice bath or just into your mini fridge) the process will go significantly faster. You could also substitute the hose for a piece of copper tubing to yield similar results.
Great idea thanks
You’re welcome 😊
Excellent vid
Many thanks 😁
I 1 question out os this topic:
Have you tried printing on flexible resin?
Is it good for cold plaster castings or epoxy?
thanks
I've not tried a coffee filter for post uv expsoure filtering so will give that a go. Out of interest, once the IPA does becomes unusable, how do you safely dispose of it?
Good idea.
Thanks John
thanks for the file man. Printing it right now
Thanks for your support 😁😁😁
I loved the reference to the "other" IPA. India Pale Ale LOL. My boy grows Hops and the local craft brewer does a lovely IPA. Yum! :D
🍺
i wonder if a sous vide stick a better temp. control for the distillation, my can go up to 90 degree, if it only take 85 degree, i think it will work and with no direct flame, it will not be as risky as burning it.
IPA Is cheap enough I'd rather buy it. But your Funnel idea was spot on. I actually thought of doing that with a colander in a funnel once, you actually applied it which might be a good idea for you to patent it before someone else does. Great video my friend!
I once devised a board game with a group of friends. It was so much fun we thought we'd Patent it. What a nightmare. It cost thousands and was so vague as to make the whole process pointless. We soon gave up.
I might dig that out one day and share it. Maybe folks might enjoy it. It's sort of like chess but with cubes 😁😁😁
@@vogman Board games specifically are very hard to patent, as you can only easily patent the physical bits. Patenting mechanics is super hard. Something like patenting a simple plastic funnel should be fairly easy by comparison. Worth looking into anyway.
When I set my used IPA next to the window I get a white sludge.
Have you considered using a carbon water filter as a final filter when your IPA has a colour "taint" which can't be removed?
As the boiling point of ipa is 180F it might be safer to use a sous vide. This gives excellent temp control. I suspect putting the receptacle in an ice bath would probably help as well. That way there are no open flames and you can maintain a closed system.
Many thanks 😁
Amazing! How about instead of a window sill, use the curing station uv? Feels like that will accelerate that process.
Otherwise, much appreciated.
I've started just syphoning the clean IPA off the top once all the cured particles sink to the bottom. Faster than a filter, though perhaps not as thorough. Maybe syphoning it into a filter would be the way to go. Would hopefully pass through the filter faster if it's already fairly clean.
Ha! Again that's something I should have thought of and didn't. Nice one 👍😁
Many moons back I set up a series of barrels to "settle" and filter Veg Oil. There's videos on my Channel. The idea was the same - take the top clean stuff and leave the dirty gunk at the but 😁😁😁
Nice vid! I was also thinking about distillation, but vacuum distillation, so I would avoid the heat. In the end problem is distillation doesn't clean your IPA. Using IPA to clear resin changes its chemical compound and distillation wouldn't revert this.
i had very good results without the distillation part.
I use the anycubic wash and cure too, when the alcohol becomes unusable (it leaves too much residue on the plate when washing), I let it cure a couple of hours in the station (I also do 1 hour of curing when the alcohol is mid life), that alone makes the resin way more gel like and easier to work on, after one day is usually all settled on the bottom and the alcohol on top is already very clear.
I then filter It with a paint filter, and recover all the gel like resin, then i filter it the last time with a paper filter (50 µm).
4:13 - OMG THE HORROR! THE ABSOLUTELY CUTE ADORABLE HORROR!!! I want one of those floofs!!!!!!
He's still just as cute - though HUGE!
I distill as a hobby, and on this scale it's probably not worth the effort.
But the UV curing and filtering is definitely worthwhile! The slow settling process has VOG going back to his roots!!
Ah yes... settling Veg Oil... what messy fun.
What about filtering through some activated carbon? Its not that expensive and can be bought on amazon in various sizes. Im wondering if that would filter out the IPA a lot better
I would love to see the math on the fuel/electricity costs in distilling it! Though, a solar still would be totally bad to the bones!
I think it would be impractical from a financial point of view. But a solar would work wonders, I agree 😁
Great video, my IPA is fairly clear but has become sticky like you showed. I think it's because I use a lot of transparent resins so it's doesn't look as cloudy but the undissolved resin is still in there. On another note, distillation ought to be allowed for scientific purposes. I don't think distilling your own vodka is any cheaper than going out and buying it, at least not where I live.
Would love to know what you are using now to clean the ipa?
Subbed at 4:30. Thanks for what you do. Legend.
Great to have you here 😁
Excellent tips, I will have to try that. Do you think leaving the bottle in front of a uv light would work or work faster than the window ledge? I just use a bowl with a lid for my wash container no fancy equipment for me lol. I lose more to evaporation cause I forget to put the lid back on, so I have to add more.
You can use an electric UV light, but sunlight is free. Plus you have to wait for it to settle anyway...
Sometimes the lazy and free way is the best way 😁😁😁
@@vogman lol, yeah, my light is LED, probably only costs a dollar to run it 24/7 for a month. Have you any experience with flex build plates? Mine wont seem to hold when I print something of a decent size. About ready to chunk it. Any suggestions?
I've avoided the flex plates because for me it was just one more thing the clean. I imagined they held themselves in place with magnetism. Isn't that the case? If it doesn't hold, you've reason to complain...
Malita Drip over funnel is made for those.. Malita coffee filters. Also just bought a distiller for making pure deionized water and for recycling my IPA.
Found a Britta filter or similar works to take some colour out (went for the cheapest Asda ones) ... Also since you have a vacuum pump vacuum filtering is much quicker
Good thinking 😁
Interesting watch
Thanks 😁
I Siphon it out. Works great.
bought. the funnel to support this channel
You are amazing. Thanks!!!
😁😁😁😁😁😁😁😁😁
There is dedicated alcohol diatation equipment, no? I saw a small rice cooker or some other kitchen type device for this
Can you use a uv cure station to cure the resin?
Any reason to not put it outside in direct sunlight?
Just a thought, but maybe the yellow sticky IPA could continue to be used as a "pre wash" and followed by new IPA as the final wash? As the newer IPA became dirty and yellow, which would take much longer, it could be added to or replace the older stuff?
That's exactly what I do 😁
Yes, I have a couple of dunking stages... the first to remove the bulk, then one to clean and finally a rinse. It sounds a lot but this vastly reduces waste.
Instead of leaving the bottle on the shelf for a couple weeks, could you just place it in a cure station if you have one and run that for a few minutes? Sunlight is obviously more energy efficient but if you don't have the outside facing storage space for example.
that funnel is great i'll need one
Thanks Shane. It works treat mate.
You take care buddy 😁😁😁
I had wondered about using a water filtering system with replaceable waters filters. But hadn't been able to give it ago.
Someone above has tried that very thing with success 😁
@@vogman Oh, cool. Was it a video here to look up?
On TH-cam? There's bound to be somewhere 😁😁😁
Would a distill machine work???
I've been thinking about getting a lab distillation setup myself just for isopropyl alcohol.
If you know what you're doing, maybe... but I'm not sure it would pay for itself in honesty. And please, safety first 😁😁
Like another commenter mentioned.. i wonder the cost of electricity vs the cost of new IPA. I don't think it takes lot of kilowat-hours, but maybe if you had solar power, it wouldn't cost a thing in electricity then.
@@keithyinger3326 we do have a small amount of solar. And the amount of iso would be small batches anyway, some to increase the percentage, or the reclaim used iso. I don't own an SLA printer (yet, FDM 😉) I'm not using huge amounts. Just need to clean the glassware.
can I use any tipe of alchol?
I'm glad your chemistry teacher taught you how to keep yourself warm....... Mine blew up the Lab !! spilling acid on my books and cutting the kids in the row behind me fortunately the glass flew over my head !! Next lesson we all wore goggles even though it wasn't a practical one LOL .....
I remember watching Miss Randall with great interest... I'm pretty sure she taught Chemistry. That bit is a little hazy 😁
@@vogman Ah yes I think our equivalent was Miss Parry the music teacher.....how she ever got close enough to the piano to play I was never sure (NB. it wasn't because she had small arms or a big stomach).....
Brilliant 😆😆😆😆😆
I wonder if a inner "holy" funnel insert could be made to fit inside a regular non printed funnel.
Could you run the bottle of IPA in a curing chamber for a bit or do you need to let it slowly cure on a window sill?
That's what I'm doing right now
But what do you do with the 'expired' IPA? How do you dispose of it?
Question: Instead of putting the bottle in sunlight would´t it possible to use for example the wash and cure Station from anycubic to get enough UV Light. Would the bottle get to much heat in this device?
You could, but daylight is free 😁
How often should i charge out my IPA? Or should i just go until it's very cloudy
That funnel is a stroke of genius.
Many thanks 😁
wouldn't distiling is better start option if you can do it ?
As an organic chemist, the idea of distilling IPA over a flame without a fume hood is pretty scary... I agree that it probably isn't worth doing at home... but if I was going to, I'd use vacuum distillation inside a sealed setup and reduce the temperature down to about 40 C. Three notes of caution here though: Glassware under vacuum can implode if it's flimsy or damaged, be aware that you may ruin an oil type vac pump if it ingests solvent vapour, and if you use a diaphragm pump you need to exhaust it outside and away from sources of ignition.
If only I'd "listened" to Miss Randall more closely rather than just looked and dreamed 😁😁😁😁
Thanks for the important input.
Very good! I would guess that maybe ultra cheap water filters might help as well. Maybe used water pitcher filters? The alcohol should slip through whatever is in there, but at the same time maybe there's alcolhol soluble crap left in a used filter. Who knows. But it might be worth trying since little filters are sometimes cheap and are meant to filter many gallons of water. One might get a lot of use out of one after UV filtering.
If it's cheap and it works, I'm all for it. The thing I love about my videos is the responses I receive. There's always plenty of suggestions and good ideas shared to benefit all. 👍😁😁😁
@@vogman hey it's what we're here for.
@@vogman I would hazard a guess that maybe a Brita filter might survive a number of cycles on diligently maintained alcohol. The sticky substance in yours might be something that would clog it up within a few uses, but it depends on just how nasty the stuff is. They aren't perfectly efficient. But I would imagine that it'll definitely help. There's videos of guys filtering beer and other various things with them and they're left with much paler fluid with only light taste. The only thing that might be more effective and more expensive would be something like a deionization filter. They usually last a long time and produce near distillation quality filtration.
Nice ideia, maybe an used class 1 water filter will do.
I dont get why you need to filter your IPA - my resin just settles at the bottom within a few days and i can decanter the almost clean IPA from the top. Does it maybe depend on the resin? Ive used Phrozens Aqua series and Anycubics Basic and UV Tough resin mostly
what about using an actual distiller that you can buy on amazon?
A question: can't we just let the ISO evaporate on the sun (and recycle the residue), if we are looking *just* for a somewhat environment-friendly solution? I'd hate to dump it in the drain, where it adds microplastic to the water. I rather buy new clean iso, than risk to torch my house.
So, I love this idea and concept, but I have an issue. Maybe it's because I used glass jars, or perhaps the quality of the IPA (98%) manufacturer wasn't good, the resin in my IPA didn't cure and settle, it congealed into this mass, hardened on the sides of the jar to the point I could barely scrape it off, and effectively have to toss about 1.5 gallons of IPA.
Any ideas what might have happened?
I honestly think it was the brand/manufacturer of the IPA because I've since used a different brand that's 99% IPA and I don't have the cloudiness or anything when rinsing the IPA off. (The original IPA I mentioned whenever water hit it would immediately get cloudy and often times left a film)
what type of ipa do you use
I have a sous-vide cooker (makes for excellent steaks!) so I might try to distil the IPA that way! :-)
Considering the allergen and toxicity of uv resins, I wouldn't put that stuff anywhere near food or food prep.
how about using heat bed of a FDM printer for the distillation part ?
That could work 😁
That funnel is pretty ingenious.
Many thanks 😁
What about making some sort of centrifuge to spin the particles out?
In my veg oil days I tried every method of filtration before realising the simple superiority of settling 😁
Always been wondering though. Why not just use a cure station to cure the resin that's in the IPA to clean it out. Wouldn't think it's worse than it sitting in the sun (maybe less heat) and i'd guess that it's a lot faster as well (especially where were the sun aint shining. Just rain and clouds).
Simply because daylight is free. You don't need sunshine, just daylight. Sunshine here in the UK is rare, but cloudy days are plentiful and the windowsill is a great spot to leave and ignore it 😁
@@vogman I did give it a try. We have the same weather here (Netherlands) so figured it couldn't hurt. And like you said. You just ignore it. Downside though. Mine stayed super cloudy. In the end i brought the contents to the dump so they can get rid of it in a propper way (didn't feel it safe to have 3L of almost pure alcohol evaporate on the balcony with a lot of people within 2.5 meters above it). Got a bit afraid it would turn into IPA jelly. Maybe i waited to long to try and clean it idk. It was fully clear before it was set in the windowsill (just a layer at the bottom) but it gotten cloudier with time to the point it started to look like the IPA jelly but not hardened yet.
New attempt next time :D. Thank you for responding :)
Stupid question couldn't you use the heated bed from your fdm printer as a heat source? It would be very controllable if it worked.
Yes, that should work 😁
several options to choose from:
Activated charcoal tablets, sold at the pharmacy.
Filter elements for painting masks.
Wood shavings in granules.
Thanks for sharing.
Maybe you can try adding some activated charcoal to the dirty IPA and shake it around a bit before letting it sit out in the sun? It might remove some of the colors/impurities.
Also, do you think you could achieve the same results putting the IPA in a UV curing chamber for a while? I’m too impatient to wait a few weeks putting it in the sun.
Charcoal is an interesting idea. As for the UV lamp, sunlight is free and you still have to WAIT for settling. You could centrifuge I suppose 😁
How do you buy IPA worldwide? I wanna buy one. I need assistance