Gum printing: Potassium Diochromate in powder form

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joshuauaua

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Has anyone prepared a sensitiser for gum printing with potassium diochromate (bichromate) in powder form? What is the process and proportions? Safety precautions a given.

Tried searching the forum for a thread on this but couldn't find any.

Appreciated
 

Vaughn

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I have mixed it as a sensitizer for other processes. First, determine what strength you wish to make the solution. Second, determine the amount you wish to make.

If I wish to make 100ml of an 8% solution of Potassium dichromate (PD), I would add 8 grams of the PD to 100 ml of distilled water and stir. If I wanted to make 25ml of an 8% soluition, then I would use 2 grams of PD to 25 ml of distilled water. There's a formula in there somewhere.

Pretty straight forward...safety precautions...dust mask, but most I have dealt with has been more like small crystals, rather than a fine powder, with nothing going into the air. However if dropped or some other type off accident happens, you do not want to breath this stuff. Gloves -- yep, always. Label it -- looks like a sugary drink -- don't store in the fridge, near glasses of orange juice, etc.

Lasts forever once made -- store in a good bottle. Do not contaminate with organics. Label it as poison.
 

Andrew O'Neill

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I mix a13% solution of potassium dichromate. 13g mixed into 100ml distilled water. Keeps indefinitely. I always wear gloves in a ventilated space.
 
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