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| | ipedia.com: Vitriol Article |
 | | Green (Iron (II)) vitriol was much used in the middle ages to make writing iron-gall nut ink. |
 | | The name was also used for various sulfate salts, such as copper (II) sulfate (blue vitriol, or rarely Roman vitriol), zinc (II) sulfate (white vitriol), Iron (II) sulfate (green vitriol), Iron (III) sulfate (vitriol of Mars), or cobalt (II) sulfate (red vitriol). |
 | | In typical applications, a solution of the vitriol is mixed with lime (calcium carbonate) to produce a fine copper carbonate suspension, which is sprayed on the plant. |
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