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| The American Heritage® Dictionary of the English Language: Fourth Edition. 2000. |
| blue vitriol |
| NOUN: | A blue, crystalline hydrous solution of copper sulfate, CuSO4·5H2O, one of the most important industrial copper salts, used in insecticides, germicides, and hair dyes and in the processing of leather and textiles. |
| The American Heritage® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved. | |
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