Quote Originally Posted by Photo Engineer View Post
Well, among others, Kodak used ethylene diamine as a silver halide solvent that was mild and did not cause excessive dichroic fog. They also have used thiocyanates as you mention for solvents, along with other organic solvents that repress dichroic fog just as the benzophenone does.

Lets consider this one solved. You all get a feather of some sort or another for really good answers. Thanks. Additions are still welcome though as there are more specific examples out there.

PE
Ilford had a product called ID-11 Plus which was said to be D-76 with the addition of Cinnamic acid and also a mercaptan, although I must confess that I don`t know what the functions of these components are, perhaps you could enlighten us.
Also, BKA sell a product called Crone C additive which is supposed to enhance the performance of D-76/ID-11 although not something that I`ve tried and not available over here in the UK.