I have been away from here for a while but now I am back. Oh shure, you only come around when you want something! Here is what I want. How much and what percentage solution of Benzotriazole do I use and at what stage of making the emulsion? Is it based on the silver content? The furmula I am using is from the Kodak AJ-12 instructions. I have gotten back to making the gelatin tintypes but this time I am going to use a chemical answer to knock out the fog problem, hopfuly. Thank you.