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Today we're testing some of the most popular methods for making clear ice and finding out which one works best and which one falls flat!
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![[Solved] Making Prince Rupert's Drops](http://i.ytimg.com/vi/VJRX3qoE6NM/mqdefault.jpg)
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I've worked in the restaurant business for about 20 years. And I was talk to a guy from one of our ice suppliers that we would get ice for carving. He said they would vibrate the water as freezing it for ice. And by vibrating the water as it freezes it gives you clear ice. Maybe you can figure out a method to do that.
thats the only way i have heard of to get clear ice is by vibrating - done in a big freezer
Thank you! That's the only way that I know of also but either no one said that before or he just completely ignored it...
Super true my mom does that at her job as a ice maker
Very true we did this as part of my grade 11 science project, we used a small motor with an oval to shake a metal plate with a container of water on top, it wasn't perfect but it was close.
Yep they vibrate the water, or some icemakers will use a pump to circulate the water as it freezes.
There was a random completely clear ice cube in my freezer's ice maker one time.
Edit: I regret to say that the ice maker that created this unlikely cube has died. Also, thanks for all the likes.
Megatoxicfireman cool
.
me too i ate it
@@lyla_1558 I dropped it T^T
.
I wish I could have a popsicle that was the same texture as ice but still flavoured. Like it would be so nice for it to be nice and smooth!!
maybe try flavored water? but i believe it being ice dilutes the flavor
@@Sinsanatis ya, I might try that, thanks!
Freeze Kool-Aid!!
@@shiphrahroshinithomas3590 np :)
Uhhhh buy a popsicle mold,juice,and uhh popsicle stic
Ice Play Button.
10:03
(I think that was intentional)
YEAH
😭😭
Since flexibility is a variable, why not use a rubber mold?
Potato_Army hm. Idk
Mythbusters found it out years ago that the best way is to constantly disturb the water with vibrations. During the freezing process this allows the bubbles to escape and a perfectly clear finish.
true... i watch mythbusters in the past too they create crystal clear ice by shake/vibrate the water.
Can I have the episode?
You can watch it, but you can't have it
I had water bottles constantly rotating in my freezer to get that affect
What episode???? cant find it
Who else watches these TKOR vids but never does them 😂😂😂
I mean...who would? I don't have a vacuum chamber just sitting in my closet at all times 😂😂
me
odiscontroller me
That’s the whole point. He does it so we don’t have to 😄. Besides. I think it’s great that they think of random things
Mmmmeeeeeeeeeeeeeeeeeeeeee
me thinking the whole time: *ice isn’t completely clear…I’m just realizing this now……*
*"let's see if we can cut the clean part off"*
*Takes screwdriver and hammer and begins smashing the block*
Quality cutting Nate...
I was picturing he would slice the ice in half with one "clean" swing 😆😆
Why didn't he just use a 1000 degres knife
duh, got a bandsaw?
Put ice with bubbles in a vacuum chamber, that might be interesting...
This needs likes
And comments
But I'll take care of the comments
So hey guys hows y'all days going?
Yeah you I'm talking to you
I always think their logo says Thor
😂😂
Sameee
Me too! 😂
Yuuuup
Thok
TKOR MORE LIKE THOR LOLOLOL
Seeing Grant in the intro made my heart drop 😭😔
Kick it under the fridge after
Try making synthetic sand in 6 diffrent ways like this one plane one with food colouring and with lipuid air freshener and all of those just with wet sand
gavi Kay why are you commenting this on another comment just do it on an independent comment
9:44 you can see a dinosaur in the ice!
Alexus Gillam ohhh yeah 😂 😆 😝
Alexus Gillam I saw that
Nice spot!
I saw it too
9:55 you can even hear one
9:28 the noise of skeletons burning in the sun(Minecraft)
🤣🤣😂😂👍🏻
Me: im gonna make clear ice
Someone: How are you going to do tha-
Me: **turns on blowtorch on ice**
Someone: uhh nevermind
Loll
You're not even wrong. Chemically speaking, that just clear ice. It's the same molecule, just arranged differently.
Can you please try liquid nitrogen versus kinetics sand to see if you can make a hard sand sculpture.
Dang I was about to comment that idea then I saw this, but yesssss. I liked this I want this to get to the top
It would be a solid, no reason to do that.
@@_Anthony___ the pure coolness factor
And if you freeze water while in vacuun?
That is what I said
water will boil
It wont. There isnt a feasable way to do so
@@rockyroadmagic4152 all they have to do is the same thing they did with the beer bottles but on a plastic container
He just needs to do the same thing as when they stored food under vacuum but with water in the freezer
The trick to clear ice is very slow freezing that's why the cooler worked better slowed freezing process
I think you also need to freeze the water bottom up. Otherwise gases in solution (which you always have, since CO2 from air dissolves in water) will get trapped and then the bubbles got nowhere to go. SO i think isolating the sides and the top of the container and letting the cold reach the water only from the bottom would work best.
no. speed doesn't make a difference. I can make clear ice with an ice cream pale sitting outside in -30C. Just as long as you bring it while there is still some water.
9:24 did anyone else kind of hear the beat to MAH MILKSHAKE BRINGS ALL DA BOIS TO DA YAAAD
I was wondering if anyone else heard it!
no :)
kittenkats 94 do you watch jtv
It was too fast
Lol 😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂😂
Freeze the trunk of a tree with liquid nitrogen then hit the frozen part with a axe.
Ethan Waldie y
@@kierankeown115 y not tho that sounds like some dope slow mo footage
Why?
Would be awsome
And if you say why dont act like that wouldnt be awsome
I think it’s a problem with how fast the water freezes. Conclusion from seeing the cooler experiment. My hypothesis tells me that through slow freezing the water you can achieve clear frozen water. But you’ll need to go from room temperature and slowly crank down the temperature by 1 degree every hour. That way you can let that gas escape the water gradually. Just a theory.
By that logic, the ice on top would have bubbles as it froze quicker. I think that the only way to get bubbles out is to freeze it from the inside out so that the bubbles get pushed out instead of trapped in as the outside freezes first
Finally someone with an actual brain. But not only do you need to freeze is slowly. You also need to have a pump or something to keep the water flowing/circulating during the zreezing process.
@@jackmoseley1628 See my comment
This is the same theory I had. It is all dependent upon how fast the ice crystals form. It can be seen the same way with berries. in the freezer a berry will turn to mush because the ice crystal form slow destroying the berry cells. Put a berry in liquid nitrogen and it freezes without becoming mush due to faster crystal formation
If you insulate most of the sides of the containers you slow down the freezing time, which lets the water freeze and expand from one direction and thus the ice doesn't "crack" on itself which is what makes it cloudy and brittle.
One way to make perfectly clear ice cubes is to cut small holes in silicon muffin trays and place them in a cooler filled with water and then suspend the muffin tray at the surface while they're almost covered with water. As the water freezes inside the muffin tray the "extra" water is forced out through the hole you cut in the bottom of the muffin form. Once your muffin forms are frozen you just crack the surface ice and take the muffin tray out, many videos on youtube on how to do it this way.
I don't usually pay that much attention to the sponsor info, but I LOVE THAT BOOK! Brandon Sanderson is one of my favorite authors!
"ice is very cool" omg I'm dying
Make a clear ice TH-cam button
They did once
∂σ ωнαт нє ѕαι∂ αℓєχ 1280z
Oofffffffflex tape man yeet
the cracks look like the arrow and it actually looks like a ice youtube play button/clear
Pickle rickkkķkkkkkķkkk
I've always heard that to get clear ice you have to use a vibrating table to constantly move the water as it's freezing and prevent air bubbles.
Exactly. Doesnt have to be a table though.
Is ur real name paterson?
@@broskie-lb2qk It is. I'm one of the rare one T Patersons. Why??
@@chrispaterson21 wait what is a rare t paterson?
@@broskie-lb2qk Paterson is most commonly spelled Patterson. With two t's. One T Patersons are less common.
Me:watches video
Also me while watches video: I want some ice now.
ONUR ERGİN i do what I want
ONUR ERGİN n I’m trying to convey is that u didn’t have to comment under my post
The clear ice from the cooler honestly looks like an ice version of the diamond play button! XD
7:17 is like a dragon breathing ice
Dylan is a big boy LOLZ
Another comment said it looked like a dinosaur
68 liked.. I am extremely humble.
Agitate or vibrate the water as it freezes for clear ice.
what if you boil, boil again, vacuum and freeze distilled water in a cooler?
The cooler is what makes it able to freeze clear. Not the process before you put it into the cooler.
You get ice
It wont boil.
Love the scientific tests. Directional freezing is a great technique. Easy and cheap. We use it for all our cocktails :) Thanks for showing the other methods.
Try molten metal vs pumpkin and liquid nitrogen vs pumpkin. For Halloween
shock wave great idea
Shockwave Backyard scientist did that go check it out with him instead of wasting a comment
Superad 12 You do know that they’ve done videos that others have done before, right?
What about using a cooler with a metal cover and flipping it upside down? The metal would conduct the heat faster than the cooler material stuff so it would freeze from the bottom, therefore allowing gas to escape from the top. Please try it!
Exectly. i wanted to see that work too.
🍪
Do you know that the ice floats on water?
Great thinking, but this will not work. A fundamental property of water is that ice always forms at the top no matter what. Naturally this is because water expands when it freezes, and ice is more buoyant. If we attempted to freeze water from the bottom only, I suspect we would end up with remarkably cracked ice. My expectation is that some ice would form at the bottom, but then float to the top, and repeat. It might be so cracked that it would not even stay together.
I’m 10 and I was just putting what i learnt from ‘ Conductors of heat ‘ in Science class. :P
I think that temperature may also affect this - if you ever revisit it, try using the method with the cooler box but at a temperature closer to zero. This would extend the freezing time which I think may help if you're wanting to avoid the bubbles which form as there is more time for the liquid to adjust before fully solidifying...
It made my day to see you recommend a Brandon Sanderson book!
Yesss my fav
To make clear ice. Place twice boiled, distilled, water in a clean balloon, hanging from the lid of a cooler, with a vibration motor to keep it agitaged while it freezes. This is similiar to a method used by Mythbusters a long time ago to get clear ice.
So basically every method at once
Exactly! It has worked for me in the past when I did the electric motor.
@@TheHeroPercy You never tried it liar
What is mythbusters
@@eduardosalamanca3808 Mythbusters was an old(er) show that was all about, well, busting myths. Using different methods to debunk or prove many myths over the years, such as (
-Can an unamplified human voice shatter a wine glass?
-Can a cell phone cause a plane to crash?
-Can a person's eyes pop out while sneezing with eyes open?
And that's only naming a few. If you ever get the chance, you should really watch the show sometime. It is still ongoing (to the best of my knowledge that is) but the original hosts Adam (Whitney) Savage and Jamie (James) (Franklin) Hyneman left in 2012.
You should boil 10 bottles of flex glue
👍Awesome. Thanks for the demo. I’m obsessed with clear ice. It’s a lot of work. If a person makes these at home, that person will have to really love/like the people they make them for , self included. 💞
4:53 scared the life outa me 😂
Can you try putting water (or any other liquid) on a shirt then putting it in a vacume chamber?
It would dry out the shirt until the water froze or completely evaporated.
@@EvelynH-tj1qt Due to the vacuum chamber lowering the pressure of the area inside, the water wouldnt freeze, but just boil off. There is no added cold to the water in the shirt, so there would be no freezing
Is it possible to make ice while vacuuming in the fridge to make clear ice🤔🤔🤔🤔
Hashtag satisfying
Whenever the water evaporates it would take energy with it because evaporated water takes more space up but takes equal heat and in turn takes warmth from the shirt freezing it.
Awww the quest for completely clear ice! It's the simple things in life that matter my friends. 😉👍👍
Source Port Services hi
If you want to have clear ice, I would try freezing it in thin layers. Like a quarter inch at a time.
RIP to the OG king
JIGJIG GOAT Rip
Here's how you make a block of ice as big as you'd like and have it be completely, 100%, bubble free and clear:
slowly drip water into a container as it is in the freezer. If you have a chest freezer you can even manage this without having to drill any holes by simply having a hose clamped between the lid and filling up the gaps with some isolating material. If you have a big enough chest freezer you could make a seriously big block of clear ice to use for ice sculpting. You have to experiment a bit to get the water drip rate right though.
By doing it like this there will always be a place for the gas to disappear into as you are forcing the ice to form from the bottom upwards.
Why do you think the top layer of a frozen river/lake always looks so nice and clear after it's rained for a bit and then frozen again? ;)
You seem to be pretty smart
thanks for the tip!!
The cooler is a reference to tipsy bartender
*@The King of Random*
Can you put a bowl of water in the vacuum chamber, make it vacuum & then put the whole chamber in the freezer & freeze the water while it's still in vacuum?
It will not be clear ice, but I think that could be cool somehow anyway, maybe like slush or something, thanks! :D
no, because you need convection between the water and the outer cold to carry the heat away, which is not happening.
how do you think thermus bottles work?
@@bcn1gh7h4wk just do work on the adiabatic system
Well, if they seal a lid on the bowl, and use their rubber stopper method, maybe...
You wanna freeze dry water?
I suggested maybe a mason jar of water under vacuum but of course the comments section is smarter than me so I searched how it's made artistic ice I found my answer
What about vibrating the water as its freezing
To begin with, they are not bubbles. Non-crystalline ice is formed because the freezing speed is very fast. crystalline ice is formed when the molecules have time to slowly create the bonds in an orderly manner
Eli not it chief
NNNNNNEEEEEEERRRRRRDDDDDD
COOL!!!!!
Berry Nice if your going to tell him he’s wrong give reasoning don’t just say he’s wrong
Now can you make an ice diamond play button?
Did that already
@@potatoestv2759 *tried
Well woopdie doo, he did!
Okay please wait a minute He wants to say that now they can make a clear diamond play button rather than a bubbled ice play vutton
Try freezing moving water
Like use a pump in a bucket and freez it
Kevin Adlem makes slushi i dont know the name
BlackBlizz259 I saw it on a epesode of tanked where they made like an jellyfish ice sculpture
Yeah I work at a place that makes ice and what I do is have a little pump and a tube I put in the water that pumps air into the that keeps the water moving using this method we make 200lb blocks of ice for carving
It'll have to be at least -20° Fahrenheit
@@falsesense6389 colder than that more like -60 lol
The best way to get clear ice:
Get a chunk of glass then try freezing it so it’s cold then BAM, CLEAR👉 ICE 👈 isn’t technically true
A) You DO NOT put the lid on the cooler! B) You DO NOT freeze the entire cooler solid!
Put bullet proof glass in the metal foundry
Benjamin Rausch it would just melt/burn or both depending on the Grade of bulletproof glass
@@unkn0vvnmystery even better making it unique because he should melt multiple different bullet proof grade glasses
I'm saying it will just melt it would not do anything special
@@unkn0vvnmystery well that's why I'm saying that he would get different types of glass made of different material and methods consisting density on how its maintained or made bulletproof
The 3 Main Grades are small handgun rounds,all handgun rounds ,and rifle rounds
The first grade is made of polycarbonate which would burn and both the grades 2 and 3 are glass which would melt
The most interesting thing that would happen is grade 1 would burn and produce a lot of toxic gases and it would be very expensive
Can you make rope with bungee cord/elastic cord and if so is it still elastic?
I would imagine that it would be
Maybe not as flexible because of the Waite pulling on the rope
WAITE
@@davidfranco5642 but waite theres more
it is, but less so. the more strands you have the more resistance you have, to the point that you can't stretch it without a lot of mass. same thing works with high tensile steel or aluminum cable, it has some stretch, but the more strands you weave the less likely it is to stretch resulting in just fatigue and snapping at less stretch distance than a single strand would break at.
If you really want clear ice, you need to use submersible water pumps set at a 45 degree angle in the water. That will keep the water moving and make the bubbles to the top.
Great comprehensive experiment thanks!
what will happen if you put gasoline in a vacuum chamber?
kabom
Boom
Rapidly will boil into a gas
He did that with Diesel
It would boil
So it seems the bubbles want to go upwards but can't because it hits an ice layer. What if you took the setup where only one direction could be frozen at a time, and had that direction facing the bottom to allow it to freeze from the bottom upwards and pushing the gas up through the liquid to get an even thinner "bubble layer"?
I see a problem with this in that ice floats.
@@spirals333 correct. The floating ice will move to the top and allow more ice to be formed in the bottom directly.
@Splarff I had the same idea you had. Maybe you could have the ice from on a heavy object like metal?
This likely won't work because of how the density of water works. For most materials the density will increase the colder it gets but for water the density will increase until it hits 4 degrees Celsius and then the density will decrease again as it gets closer to the freezing temperature. This is why ice floats and why the temperature at the bottom of a frozen lake that is not frozen solid is likely to be around 4 degrees.
You could try to flash freeze water from the bottom but I still don't think it would work that well and you'd have a huge block of ice that would quickly rise to the surface.
You could possibly also bring all of the water to as close to the freezing point as you could, making sure that the whole container had the same temperature and then lowering the temperature below freezing.
@Dr. Foto: I am familiar with the changing density of water in regards to temperature. I believe ice is only about 7% less dense which is why I suggested a piece of metal for the ice to form around until the ice had time to form around the edges and sides. If the ice forms uniformly on the bottom, it would be very difficult for the ice to unstick itself and float to the top. Have you ever had a cup with a whole frozen piece of ice on the bottom and poured water in it? It doesn't float until it melts a bit and the water is allowed to flow to the bottom.
I read that freezing bottom up works. Can you see if that’s true?
That was what they tried with the play button previously. Still hazed with bubbles.
May he rest in peace 🙏❤️
can you make a smoke machine for halloween?
smoke machines are carcinogenic (similar to vapeing)
TH-cam Thing I got a small fog machine that runs on water for Halloween(I don’t have it anymore)
@@SustainableGal Where'd you get bs from ?
thanks for everyone who liked and commented my comment i really hope he does this :D
Yeah cool
Can you try to make a lense with the clear ice? Maybe see if you can get a strong focal point for sunlight?
It’s gonna have cold light won’t work
" HEY Cephus!!" Yeah.... " Hand me mah tool box.." You mean the fancy one with the big hammer and screwdriver? " You darn tootin!!"
You have to freeze it slower for clear ice
We all have gas and contaminants. :-)
Ikr
Ye
Now make clear ice diamond play button
Omg I want this to happen so bad
He did that
yhh...the one they made earlier is not clear
can you maybe freeze it in vacuum chamber i know it boils
He already has
Can you please carbonate water with a flammable gas and then freeze it in a cooler to push the bubbles to the bottom and then remove the clear ice. Finally set the non clear ice on fire and see if it will burn. Please. I love your videos
I suggest u try to cover all the container i think it might work
Put pop rocks in liquid nitrogen, then see if it still pops!!!
Needs a control group but nice vid
Edit: also freezing temp might affect the clarity. All of the ice blocks had some clarity. The tap water frozen in the large cooler had roughly the same proportion of clear ice to not clear ice, the size was just increased.
Me: cool ice!
My brain: I WANT TO EAT IT!
First time I’m actually doing one of your projects (that’s not explosive or chemistry based) so I can enjoy a bottle of bourbon I bought myself
or you could just do it like all the professional ice makers and agitate the water while freezing.....
I agree and use a submersible water pump I learned that from How It's Made ice sculptures same concept bigger scale
He's obviously trying to do it without breaking the bank lol. Not everyone can afford an agitator + a tank big enough for it to matter
The best way i found to make clear ice is to freez it while it is moving (so freez flowing water) thats also the way ice is produced for sculptureing (sry for the bad english)
Yeah, bang on. Best way for small loads like that is duct tape a running vibrator to the tub.
Admiral Belzediel what vibrator are you talking about? ;)
Laurent Pierce lmaoooo
Laurent Pierce lol
@@laurentpierce1561 Don't, just don't..
Try putting the water in a vacuum, and then freeze it while it is still in a vacuum... :D
Man seeing the puck shaped ice gave me a very fun idea, someone should make a hockey puck from ice then play ice hockey with the ice puck instead of using a normal rubber hockey puck or for additional fun freeze a rubber puck in water and Make it super slippery due to ice on ice contact.
The easiest way to get clear ice is by having the water vibrate as it freezes. It takes longer to freeze but it works so well that is how many ice sculptors do it.
_(Also some use metal containers but i have no idea if that is a common thing or just the easiest available one.)_
How come all the top comments are just about putting something in the vacuum chamber. He has already made a bunch of videos like that.
*skips a bit because hes talking too much*
* skips straght to the sponsers*
hmmmmmmmvjbdjbhvsuervsulg
Same😫
I know this was a year ago but just... don’t skip the video
Pickle Chicken
its their choice?????? Lol? Let people skip what they want
5 Y.O me trying to make clear ice:
*Is it possible to learn this power?*
You should've used the styro slicer to cut the ice
The G&J
Not gonna work
It would take too long to cut, that wire does not have enough power running through it to easily melt ice.
Heat is very inefficient at cutting or melting ice because it creates a very small liquid or vapor barrier
might as well smash the slicer instead. would break it faster
Diamond play button made of ice
So an ice play button?
Only because It will break the diamond play button and get inside the tiny cracks where the Dimond is and I know that only because he's already done it before
look like normal ice id see in my mcdonalds soda
Hi try putting boiling water straight in the freezer when it's hot it works on a similar principle to moving water when you get clear ice in a bar it's because it's run over a cold plate
Have you ever tried molten metal inside of liquid nitrogen?
It’s not going to be very interesting
Other channels have tried it b4 and the results are as expected
Aspect yes he has at lest I think
Yes he did
Heller
You should make a clear ice TH-cam play button!
They already did
They already tried that.
Pual Thomas I just said that
Potatoes tv, I didn’t see that until after I commented.
Lol jk
Hey Nate to get perfectly clear ice you need the put a pump in the cooler because the moving water brings the air bubbles to the top and you can get the whole cooler full of perfectly clear ice
It's been mentioned below in at least one form, but in the past I have seen people experiment with this and found that agitating the water as it froze slowly allowed most of those bubbles to escape rather than getting trapped in the ice.
Show us some fun chemical reactions we can try at home
Baking soda and vi igar
Or memorize the chemical reaction table, then you dont have to ask these queations
christian castillo r/iamverysmart
Burning toothpaste cause a different color fire
@@superbugsy6872 r/ilinksubsonyoutube
Can you try freezing nail polish in liquid nitrogen?
Caitlin Evans so uncreative
No
Nikolai Sverdrup indeed
yeet
Nikolai Sverdrup well I’m curious what will react like
from my understanding is the speed at which water freezes causes more or less bubbles. the slower the freezing process the more time water has to settle in a "Clear" formation
What if you freeze the ice from the bottom up so the bubbles can go out as they get created// setting in nitrogen liquid?
What if you freeze it in a vacuumed container by using the same or similar method used for the stale food test?
Try to remove air bubbles traped between a screen and a screen protector by putting the phone in vacuum chamber
like if you think that will be interesting👍
Use the ink from a couple of videos ago and see if you can use it in mini flame thrower
Ink isn't flammable.
Josh Lofties that was what i was thinking like? Bruh.
Why did you have the lid on the cooler? You're supposed to do it with not top so it can freeze top down.
Not top...? You mean 'without the top s....' ☺☺😃😂
You are correct
Professional ice sculptors make incredibly clear ice by constantly disturbing the water while its freezing. This pushes all the impurities to a thin line in the center of the ice.
I'm no genius but if you slowly freeze the water I'm, talking like super slow I'm 100 percent positive that you'll get clear ice
Exactly my thought. They all have white in the middle so pretty sure thats the problem
After thinking about it i think if the water froze instantly it would probably be clear since no bubbles could form under the ice
That is usually how they make ice for sculpting
The water must freeze slowly.
Yes and no. What you mean is to drop the temp to near feeezing before actually dropping to freezing. This slows the molecules down so that ice crystals won't form when it freezes.
@Guodlca Ok, I misspoke. You obviously don't know what what happens when crystals form. So, the crystal lattice doesn't form.
Didn't Mythbusters do this a long time ago while trying to make a sphere of ice to start a fire? they had an electric vibrations motor strapped to the container similar to one you'd find in a video game controller.
May have been worth including "Random fact" H2O is the only molecular compound that freezes from the top down (as we likely would not exist otherwise). AND FYI, "Myth Busters" covered 'clear ice' in episode on 'starting fire with ice'.
I believe the reason for formation of "bubbles" is completely different than most people here say.
Ice has lower density than water. When we freeze it, it expands in all directions. We can all agree on that.
In the freezer ice starts forming from all sides, compressing liquid water in the center. Then this water turns to ice, expanding, cracking under tension and breaking the structure around itself.
You can clearly see a bulge from this expansion on top of every test cup.
That explains why mixing works - this way, water can freeze simultaneously at all points since there's no difference in temperature. Popsicles are also formed from untreated water carrying dirt from roofs, yet they are completely clear - that's because they gradually grow in size and the ice from droplets of water expands outside, leaving the core undamaged. Some ice generators use that principle as well.