- 2
- 57 520
DeletionScheduled Jon Hilty
เข้าร่วมเมื่อ 9 ต.ค. 2011
Inking a bromoil
I'm a bromoil noob, so don't watch this expecting to pick up techniques or anything -- I'm probably doing them wrong.
มุมมอง: 3 488
วีดีโอ
Making a tri color gum print
มุมมอง 54K11 ปีที่แล้ว
A quick look at me making a tri color gum bichromate print. Sorry about the awful narration. Check out my flickr for other fun photo projects www.flickr.com/photos/95242405@N06/ EDIT Hi everyone, I hope this video has helped out a bit. Now that I am 7 months older and wiser than I was when I made this video, I've got two big points I want to go back on: 1. I HIGHLY recommend you do not use lase...
very interesting! I came across this whilst looking for holographic chemicals
what negative did you use for the graphite exposure?
How to develop in negetive on paper. please explain
Does this work on fabrics too or just paper?
Works on anything you can coat and rinse. A friend of mine use to print her desing on cloathes and fabrics like this, it reacts differently tho, depends on what fabric you use, some absorb the sollution deep into itself and were hard to work with while rinsing
brilliant
Thanks for the video! I am trying alternative processes and I will try this one! I am uploading videos on my TH-cam channel dedicated to film photography.
What paper do you use?
FB paper. You can't use RC papers in this technique.
What brand I mean? Ilford , Rollei , fooma?
I think the reason your graphite layer is adding too much dark to your image is because you started with 3 colours (RGB) and you printed 4. If you converted the image to CMYK first the K channel would give you a much lighter/lesser amount of black. This is essentially how 4 colour process (or CMYK) printing works too. Plus, why not just use black watercolour for your pigment? Wouldnt that avoid some of the issues you were having with the graphite sloughing off in development? Nice job though and great results.
Hi, my name is Hosney, I'm from Brazil, one question what is the pigmente black used?
Hey Hosney! I used graphite in the video. This can work alright, but it often leads to the layer becoming very fragile, and falls off easily in the water. I would recommend instead just using black watercolor paint
Thanks, this video is amizing.
cool process
What materials are you using? I'm thinking of using this for my project, I mean the process, not your photo, but we have to use traditional photography, so I'm not sure how to do that yet.
Hey there. You don't need all that much to get started... Gum Arabic (I get mine premixed from Photographer's Formulary) Potassium Dichromate (~50g) Watercolors Watercolor Paper Paintbrush Black Light (or halogen light) Negatives Once you get a hold of the Potassium Dichromate and Gum Arabic, the materials will last you a super long time
How much does gum arabic, porassium, and black lights cost? Where can I get those? Can I get those at Walmart?
You can pick up Potassium Dichromate and photo-grade Gum Arabic from Amazon. I got my blacklight from Walmart years ago, so you can probably get by with that. Just remember, be very careful when handling the potassium dichromate.
Love it
It looks like you're using acrylic paint? Poster paint gives much richer colour and contrast.
I'm assuming here he's using watercolor paint, that's sort of the the standard when it comes to gum bichromate but certainly isn't the only option; any water soluble pigment will do the job.
Is that last photo outside of Presti's in Little Italy, Cleveland?!
Great eye! I used to live over on Murray Hill back when I made this video.
Nice, I lived in Little Italy and worked at the Murray Hill Market when I was in school.
Hi , does this work under sunlight?
Hey Julia! If you haven't tried it by now -- yes, it works fine under sunlight. The exposure should be reduced considerably. I never did it much myself, as there were already too many variables in this process to control for. Good luck!
How many watts is that light bulb, is it enough to cover the whole print area evenly?
Hey Bozhidar! Sorry for the late reply. It covered the entire print area (no vignetting that I never noticed). I don't know how many watts it was rated for, as I don't have the original packaging anymore. I did move on to halogen lamps eventually, but the exposure times weren't reduced all that much vs. the additional power it consumed.
you're the best
I have potassium dichromate in powder. Should I mix it with water first or add directly to the watercolor and gum arabic?
+Susie B Hey Susie, sorry for the long response time. I use a saturated solution of potassium dichromate and water -- saturated means I keep adding more until it won't dissolve anymore. That should be right around 13g per 100mL of water. Then I use equal parts of this solution and the gum arabic solution, and mix them together with the watercolor.
cool!
I live in Germany, just come along on gum processing. Some Chromium salts are sorted out from any "private use" in the EU. No change to do this at home. If anyone knows a good replacement for Ammonium dichromate, or Kaliumdichromat would be nice to text me.
+Alexander Timoshenko Look into something called the "Chiba System". I believe it's a method to emulate a gum print, using ferric ammonium citrate to replace the dichromate. It looks like it's slightly more complicated, but it should be a workable alternative.
Awesome! Thank you! It's time to start shopping.
Hi, thank you for posting this video, I've been trying this printing proces and I have some questions for you, 1 when you prepare the paper with gelatin and then you harden it with Glioxile ( what is the proportion gelatin-watter and glioxile-water?) 2 when you print the color yellow, are you using the green channel? 3 do you know a solution to better preserve the copies?, to avoid fungus maybe? thank you very much in advance! Alexa
thanks. will ck them out :)
nice video Jon. I actually like the music :) question: do you regular black light bulbs? like for aquariums? It looked like you just had 2.
Devon Fox Thanks! The bulb I was using here was just a standard "party" black light bulb. I think I picked up a couple from Walmart. I haven't had time to make prints with it lately, but I've found that using a halogen worklight to give faster exposures -- just make sure you remove the glass UV filter first!
hi thanks so much for this tutorial which layer do you use for the graphite ? the blue one? thanks for your answer
Schaut ja total einfacht und klar aus. Kriegt auch tolle Farben hin..... Naja, unsere sind ja auch nicht schlecht geworden Küsschen
you're doing it pretty well, it's not common to see such a fast build-up. your bleaching, ink, paper, brush and technique are in harmony. i wish i could do that finally..
hi, i'm trying this process now, would you please share your exact measurments/ recipe for the different pigments when making the emulsions? thank you!
Hey Sara, I've never really been able to really get all the wrinkles out of this project. I think I was just using a crappy printer with no color curves in photoshop, so most of them didn't really come out too well. But here's a good starting point: Prepare a saturated solution of potassium dichromate and water (~13 grams of KDi in 100mL of water, keep adding until no more will dissolve in the water. Be careful with the KDi!!!) I'm not sure what my gum arabic concentrations are, I use a premixed bottle from the Photographer's Formulary. It'll last forever. My watercolors are cadmium yellow, alizarin crimson and phthalo blue for YMC respectively. Mix about 800mg of your watercolor + 15mL (1 tablespoon) of Gum Arabic + 15mL KDi solution. If you're using a black watercolor, use about 200 - 400mg. If you don't like the final print's color balance, try messing with the color balance in photoshop and reprint the negatives.
Great !
congrat!!!!