Make your own Photo Emulsion
I found this great tutorial on Instructables for “true DIY guide to screen printing” and it included instructions on making photo emulsion using a chemical called Potassium Dichromate (which I found at Kama Pigment in Montreal). It’s highly toxic but if done carefully won’t kill you.
Some might ask “why not just buy Diazo photo emulsion for $20?”… well because once you mix the kit you have to use it all within a couple days and then it’s garbage. for $20 and making it yourself you have 5 times as much, which you only have to mix as much as you will use in a couple days and save the rest for later.
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This stuff is commonly used for Gum Bichromate printing, a photographic process passed down by the ancients. It’s known to be pretty fussy, but the effect is just gorgeous. Take a look for yourself.
http://www.alternativephotography.com/gall_gumbichromates.html
How do you get to the actual tutorial…..?
Hi… the link to the Instructable is in my post there… but this is it http://www.instructables.com/id/STFL74AFL2BQOP6/
fyi the recipe I’ve come to use is:
1 & 1/2 tsp Potassium Dichromate
1/4 c water
mix together till crystals dissolve in water (do this in a very dim lit room)
and add 1 & 1/4 cups of glue and mix well
exposure time with 150 watt bulb 20″ above is about 30 min for 14″x17″ screen
good luck and let me know how it goes! 