iandvaag
Member
In true B&W films, the image is made of silver (black metallic silver, not silver halide).
The problem with silver halides is that they are not sensitive to all wavelengths of light, i.e. they are not panchromatic. To solve this problem, sensitizing dyes are added to the emulsion, making the AgX sensitive to a wider spectrum of light. In the case of IR films, additional sensitizing dyes are needed to increase sensitivity into the IR range.
In color films, there are also color-couplers (which are themselves colorless) that react with oxidation products of the color developer to form the dye that makes up the final image.
The problem with silver halides is that they are not sensitive to all wavelengths of light, i.e. they are not panchromatic. To solve this problem, sensitizing dyes are added to the emulsion, making the AgX sensitive to a wider spectrum of light. In the case of IR films, additional sensitizing dyes are needed to increase sensitivity into the IR range.
In color films, there are also color-couplers (which are themselves colorless) that react with oxidation products of the color developer to form the dye that makes up the final image.