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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]
A hydrous solution of copper sulfate that is applied to the surface of a metal for layout purposes.