Editing Photographic processing (section)

===Black and white reversal processing===
This process has three additional stages:
# Following the first developer and rinse, the film is bleached to remove the developed negative image. This negative image is composed of metallic silver formed in the first developer step. The bleach used here only affects the negative, metallic silver grains, it does not affect the unexposed and therefore undeveloped silver halide. The film then contains a latent positive image formed from unexposed and undeveloped silver halide salts.
# The film is [[fogging (photography)|fogged]], either chemically or by exposure to light.
# The remaining silver halide salts are developed in the second developer, converting them into a positive image composed of metallic silver.
# Finally, the film is fixed, washed, dried and cut.<ref>Photographic Almanac, 1956, p. 149–155</ref>