Amidol for AZO is print developer for use with AZO paper.
Amidol is regarded as one of the finest developers available. It produces rich, strong, black tones, which are slightly cool. Amidol works best on bromide paper where it produces a pleasing tonal range. Because of its unique developing qualities, amidol is the favorite developer of photographers who exhibit their prints.
Although amidol is an excellent developer, it has a number of drawbacks. It is toxic and expensive. It does not keep well in solution. (Its useful life is about 8 hours.) And because amidol stains everything it comes into contact with, it is not pleasant to work with.