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Step 3WARNING: HARMFUL CHEMICALS aka phto emustion
Step One: make a sensitizing solution
Use rubber gloves, apron, and eye protection.
This is toxic and can penetrate skin.
14 grams of Potassium Dichromate (from ceramic chemical suppliers)
4 fluid ounces of water.This can be stored in a dark glass bottle in a dark place for several months. I bought my potassium from ebay, 1lb for $20 (including shipping) this proves beneficial if your doing A LOT of screen printing cause 1lb = 543 grams. Elmer's glue is like $.25 each so I stocked up.
Step Two: make a photo sensitive emulsion
Use rubber gloves.
This is toxic and can penetrate skin.
10 parts Elmer's Glue (by volume)
2 parts sensitizing solution
mix it
Keeps in total dark for a day or so. Work in dim light.
Use a small piece of mat board to spread the glue thinly across the fabric to close the mesh with glue as thin as possible to stop up the fabric. Work from both sides to spread it thinly.
Dry in a dark closet.
Use rubber gloves, apron, and eye protection.
This is toxic and can penetrate skin.
14 grams of Potassium Dichromate (from ceramic chemical suppliers)
4 fluid ounces of water.This can be stored in a dark glass bottle in a dark place for several months. I bought my potassium from ebay, 1lb for $20 (including shipping) this proves beneficial if your doing A LOT of screen printing cause 1lb = 543 grams. Elmer's glue is like $.25 each so I stocked up.
Step Two: make a photo sensitive emulsion
Use rubber gloves.
This is toxic and can penetrate skin.
10 parts Elmer's Glue (by volume)
2 parts sensitizing solution
mix it
Keeps in total dark for a day or so. Work in dim light.
Use a small piece of mat board to spread the glue thinly across the fabric to close the mesh with glue as thin as possible to stop up the fabric. Work from both sides to spread it thinly.
Dry in a dark closet.
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Check this out . Potassium dichromate
Martin and Pleasance Hayfever Relief - Oral Spray
Product Description
- 25ml oral spray
This homoeopathic medicine has been prepared by traditional methods for the temporary relief of symptoms associated with:
- Itchy eyes and nose
- Antihistamine reaction
- Runny eyes and nose
- Sneezing
- Catarrh (mucus blockage or discharge often caused by swelling of mucous membranes and by excess mucus)
Ingredients:
Potassium dichromate (Kali bich) 12X
Schoenocaulon officinale (Sabadila) 6X
Potassium Sulfate (Kali sulph) 6X
Sodium chloride (Nat mur) 6X
Phleum pratense 12X
Euphrasis officinalis 6X
Allium cepa 6X
Histamine dihydrochloride 60X
since I don't have a scale I am using cooking conversions to figure out how much potassium to mix with water and so on... so assuming the potassium has about the density of salt or sugar, I'm going to mix 1Tablespoon (level not heaping) of potassium with 4 oz of water. (http://www.onlineconversion.com/weight_volume_cooking.htm)
and because one bottle of elmers glue is 4 oz, I'm going to mix slightly less than 1 oz (should be .8 oz) of the potassium/water solution with two bottles of glue.
that should be enough to try with a few screens... if it doesnt work I havent wasted too much money and can adjust the emulsion stronger/weaker next round.
thanks for the great tutorial and info about this potassium mixture... I've been doing screen printing for about 6 years and the emulsion bit has always been an obstacle. and I've read tons of different diy/cheap tutorials and info online and this is the first time anyone has mentioned making your own emulsion like this.
cheers!
(453.59237g)
Lets look for a hobby that wont kill me faster. Power tools are bad enough.
http://en.wikipedia.org/wiki/Potassium_dichromate
Are store bought emulsions this toxic too?
Maybe stone tablets are my only option.