18:14 · An early chemistry sign for vitriol. The vitriols are compounds of sulphur and some metal. They are formed when a metal is dissolved in sulphuric acid and the liquid then is allowed to evaporate. In earlier times sulphuric acid (see in Group 53) was produced by roasting iron vitriol, i.e.. When talking about vitriol one usually referred to copper sulphate. Sulphuric acid was often referred to as vitriol oil.
    Vitriol could also be drawn and , and otherwise.

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