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Freebase Commons Common /common

  • White to beige crystalline powder. Stable, but hygroscopic, air and light sensitive. Incompatible with strong oxidizing agents. Photographic developer, intermediate in manufacture of sulfur and azo dyes, in dyeing furs and feathers p-aminophenol.

Freebase Commons Chemistry /chemistry

  • Very soluble in cold water, its principal use is in the preparation of very concentrated developers with caustic alkalies which will stand dilution from 20 to 100 times. These concentrated solutions keep well and should only be diluted immediately before use. They work rapidly, are free from fogging properties and do not stain. They are not sensitive to variations of temperature nor do higher temperatures affect their clean working. They can, however, cause excessive swelling at high temperature because of high pH and low concentration. The diluted solutions are suitable as high-definition developers. Alkali carbonate should not be used with this substance as they precipitate out the base and prevent the preparation of any but very dilute solutions.

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