Quote Originally Posted by Photo Engineer
Gerald, sorry, this is wrong.

Kodak and Agfa both used side chains from the start. The side chains on Kodak couplers were nonionic but the Agfa side chains were ionic (sulfonic acids or carboxylic acids).

Kodak couplers were dissolved in organic solvents, while the Agfa couplers were dissolved in mild alkali and then placed directly into the gelatin. As a result, the Agfa couplers tended to thicken the gelatin and make coating more difficult. Therefore, in the mid 70s, Agfa, Fuji and Konishiroku (all users of the Agfa method btw) converted to the Kodak method of long chain non-ionic couplers in organic solvents.

Perhaps my choice of the term "resin beads" was not accurate although I have seen this term used before. A text that it consulted refers to "oily droplets".

"Others though, notably those of the Ektachrome type, have oily droplets in the gelatine which have been used to suspend the color couplers. These droplets have a refractive index different from that of the gelatine when wet and give the film an opalescent appearance: the color balance also looks wrong when the film is wet."

The Agfa films do not use this method depending on the weight of the coupler molecules to prevent drift in the emulsion.