I, cheap guy that I be, am looking for a formula and other information regarding home preparation of a Sistan equivalent. I already realize that the principal ingredient is potassium thiocyanate. Here are my questions. Formula for mixing. concentrate usage. amount of time in the bath the amount of coverage for a given amount of bath will process. It should be easy to discern what I know about this chemistry...virtually nothing. All I am trying to do is to produce prints with an enhanced LE. The prints will be subjected to a 2 baths of hardening fixer, hypo eliminator..not hypo clearing agent, 1:40 selenium toning. I realize that there is a school of thought that says that some residual hypo is good for the print in terms of resistance to air pollution. What is not stated is what amount of hypo should be left in the print and a technique to measure it that one may apply with confidence at home. I am neither taking issue with the accuracy of these statements nor am I trying to pick a quarrel who process in a different manner..different strokes for different folks. I believe a hardened print may have some benefits in terms of abrasion resistence or the application of pressure to the face of the print. I realize that hardening will reduce washing efficiency..hence the use of hypo eliminator and make spotting more difficult...nothing is quite as satisfactory as a print that does not require spotting. I also realize that I could enhance print LE though the use of heavy sulphide toning whose print colors I ordinarily dislike for my own work...I like slightly cool to neutral print colors. So, it seems to me that a Sistan like solution may be helpful.