blue vitriol

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blue vitriol,

the pentahydrate of cupric sulfatecupric sulfate
or copper (II) sulfate,
chemical compound, CuSO4, taking the form of white rhombohedral crystals or amorphous powder. It decomposes at 650°C; to cupric oxide (CuO).
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blue vitriol

[′blü ′vit·rē‚ȯl]
(materials)
A hydrous solution of copper sulfate that is applied to the surface of a metal for layout purposes.
(mineralogy)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.