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potassium binoxalate

noun, Chemistry
1.
a white, crystalline, hygroscopic, poisonous solid, KHC 2 O 4 , that is usually hydrated: used chiefly for removing ink stains, cleaning metal and wood, and in photography.
Also called salt of sorrel, sorrel salt, potassium acid oxalate.

salt of sorrel

noun, Chemistry
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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