Today's dyes are very soluble in water and therefore are easier to handle! The ones you are reading about are from 50 years ago or so. This is (or was) so secret that we were not allowed to publish! Chemical sensitization with Sulfur and Gold was another restricted topic. I was not let on on the latest in that field until just before I retired. The emulsion scaling software was working so well that they wanted to try to build a finish scaling model based on Activation Energy in K.Cal / Mole of Silver.

Regarding what Mees says in his forward about emulsions, one reviewer of my book has stated that I have written that chapter. I want everyone to know that it is not deeply technical with lots of theory and chemistry. It is more explanatory and practical for home lab use.

PE