配方类型:

METALS

配方说明:

Developing the Color

配方组成:

配制方法:

One or two seconds' exposure to a moist ammonia atmosphere will cause the formation of a dense insoluble dye in the unexposed areas of the aluminum. The background sometimes contains a white precipitate.
Dyes generally change color with pH. For this reason the final color appears only after the ammonia has completely evaporated.