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blue vitriol

noun

, Chemistry, Mineralogy.
  1. 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.


blue vitriol

noun

  1. the fully hydrated blue crystalline form of copper sulphate
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


blue vitriol

  1. 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: CuSO 4 ·5H 2 O.


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Word History and Origins

Origin of blue vitriol1

First recorded in 1760–70
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Example Sentences

Put in that fifty pounds of blue vitriol and fill with water, throwing a little straw over the top.

For long, green vitriol was confused with blue vitriol, which generally occurs as an impurity in crude green vitriol.

It is prepared as follows: Dissolve four pounds of blue vitriol (blue stone, or copper sulphate) in several gallons of water.

For each pound of logwood, dissolve an ounce of blue vitriol in lukewarm water sufficient to wet the goods.

There is no trace; of sweetness in the constituents of sugar of lead, or of blueness in the constituents of blue vitriol.

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