relistan
Member
Interesting, thanks, it may be that this is what was floating around in there. I had etidronic acid from work I had done attempting to replicate results from patents for bleaches. One of the many, many formulas involved a fair amount of it. Alas that formula was of little practical use and I am left with a fair amount of etidronic acid. I think this is the only developer where I used it. I will probably refrain in the future, given what you said. I recall Rudeofus mentioning this as well.Using tap water and only HEDPA as a chelating agent will give you a white flocculant precipitate that kinda looks like biological growth. HEDPA freaks out around calcium ions and forms insoluble complexes. That's why in every color developer where it's included, it is usually done alongside DTPA, NTA, or some aminopolycarboxylic derivative like AMTP.