One of the mysteries of the English language finally explained.
Crystalline ferrous sulfate.
- ‘In a little while all the liquid had disappeared and there were left beautiful green crystals; sulphate of iron, or green vitriol, is the name of them.’
- ‘The acids are extracted from the partially decomposed bark and, after drying for storage, are freshly mixed for use with wine and green vitriol.’
- ‘‘The source of the iron in medieval inks is green vitriol, an iron sulfate,’ Olin continues.’
- ‘Much green vitriol was prepared at Deptford from ‘martial pyrites’ the common name then for IRON pyrites.’
- ‘When the production of green vitriol was no longer convenient, the factory was closed and in 1872 demolished.’
green vitriol/ɡrēn ˈvitrēəl/
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