green vitriol

See copperas.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

green vitriol

(Elements & Compounds) another name for ferrous sulphate

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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References in periodicals archive

He was later exposed as a hairdresser and dance master in the Isle of Manp Copperas Hill is named after the copperas - or green vitriol - dye works owned by Richard Hughes who became a mayor of Liverpool.

The Folly Fair, chemical plants and a woman of masculine stature - the forgotten history of Liverpool

But when he mixed Dipple's potash with green vitriol (iron sulfate), according to one of his recipes, he got a brilliant blue colour.

Mrs. Stewart's Bluing

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