: I had a student pose an alternative process question for which I : cannot answer. : : Does anyone have an idea of what this student is referring to? : : " There was a technique I learned in high school which I'm pretty sure : is called : photo bleaching. It's where you draw over a black and white photo in : permanent : marker then let it sit in potassium iodine or some chemical. I was : wondering if : you were familiar with this technique, and if so, if you could help me : obtain : the materials I would need and teach me the exact process. I wanted to : use this : technique in my final black and white photography project." oh man, I thought that was *my* secret trick! :) it was something I reserved for the graphic design students who took photo units! Yes - draw away happily with a permanent marker then soak the print in either of : Bleach 1 Hydrochloric acid (30% solution) 200ml Copper sulphate 200g water to make up to 1 litre Dilute the bleach 1:10 for use and soak prints before placing them in the bleach to ensure consistent bleaching Bleach 2 Potassium Ferricyanide 50g Potassium Bromide 50g* Water to make up to 1 litre working strength Bleach 3 water 500ml Potassium bichromate 5g Hydrochloric acid (35%) conc. 40ml Dilute the bleach 1:10 Bleach 4 Potassium permanganate bleach Part A 5g potassium perm & water to make 1l part B HCl 80ml & water to make 1l add 1 part A & 1 part B & 6 parts water prior to use Bleach 5 Potassium iodide 16g Iodine 4g water to make 1 litre dilute the stock solution 1:20 for use. After reduction, rinse then re-fix, washing well after fixing. Some staining may occur, removable by soaking in a 5% sodiuum sulphite solution. The Iodine bleach (5) is the most prone to staining and is probably the most expensive to make (the iodine costs $$$) - bleach 1 is the cheapest and probably the best for the intended application have fun! :)
