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blue' vit'riol



Chem., Mineral.
a salt, copper sulfate, CuSO4·5H2O, occurring naturally as large transparent, deep-blue triclinic crystals, appearing in its anhydrous state as a white powder: used chiefly as a mordant, insecticide, fungicide, and in engraving. Also called blue copperas, chalcanthite, cupric sulfate.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

blue velvetblue-water
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