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developer
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The Salt of the World?
- Developer - n. - One who, or that which, develops.
- Developer - n. - A reagent by the action of which the latent image upon a photographic plate, after exposure in the camera, or otherwise, is developed and visible.
- Pyrogallol - n. - A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes.