blue vitriol

blue vitriol

noun Chemistry, Mineralogy.
a salt, copper sulfate, CuSO 4 ⋅5H 2 O, 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.


Origin:
1760–70

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Collins
World English Dictionary
blue vitriol
 
n
the fully hydrated blue crystalline form of copper sulphate

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
blue vitriol  
A blue, crystalline compound of copper sulfate. Blue vitriol is soluble in water, and is a very important industrial salt of copper. It is used in insecticides and germicides, in electrolytes for batteries, and in electroplating baths. Chemical formula: CuSO4·5H2O.
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