![]() ![]() The color film contains (simplified view) 3 emulsions: one sensitive to red, one to blue and one to green light, the three primary light colors. We develop the film in a black and white developer. OK – how is it done? Let’s talk about the positive process of a color film like the E-6 (Ektachrome slide process). The second developing deposits tufts of metallic silver, but this time, the blackening will be a positive image. ![]() If we could somehow remove the tufts of silver without disturbing the unexposed crystal, we could then fog the film with light and develop the film again. Actually these unexposed and undeveloped crystals are the exact counterpart of the image. In each of these unit areas are salts of sliver crystals that were not exposed, and therefore not reduced by the developer. Now every photo film or photo paper image exits the developer with many tufts of metallic silver in every unit area. ![]() When the crystal is reduced, the halogen portion is dissolved by the waters of the developer. The other half of the crystal is called a halogen (Swedish for salt maker). It’s the amount of silver in any one unit area that determines if that area is black, dark-gray, light-gray or clear. The developer is formulated to be selective in that it seeks out exposed crystals and reduces them (splits them). These are crystals with varying sensitivity to light. The photographic emulsion is a mix of salts of silver. I researched this quite a bit ago and found the following two sites to be quite useful in my experiments:
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