Definition of "amidol" []

• A colorless crystalline compound, C6H3(NH2)2OH·2HCl, used as a photographic developer. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "We needed not only the essential bulk chemicals, such as amidol, metol, para-amidophenol, and glycine, but also certain rarer substances, such as the photographic sensitisers, which were so essential for the Air Force."
• "An excellent developer which must be used freshly mixed, and may be made up in a moment, is as follows: Take 1-1/2 ounces of a 25 per cent solution of sodium sulphite; dry amidol, 30 grains; 5 to 10 drops of a 10 per cent solution of potassium bromide, and dilute with 4-1/2 ounces of water."