Spirit of vitriol

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Related to Spirit of vitriol: E513
(Chem.) sulphuric acid; - so called because formerly obtained by the distillation of green vitriol.

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The mixture was heated until red and then immersed in a solution of diluted spirit of vitriol, or sulphuric acid, to eradicate any impurities from the surface, which could then be polished to a good shine.