In alchemy and early chemistry, this symbol represented ink.
Specifically this symbol refers to Atramentum, or Iron Gall ink, Ferrous Tannate &Gallate, a formulation of an Iron salt, usually from Green Vitriol (Iron Sulfate) and Gallic Acid from Oak Gall, thickened with Gum Arabic and sometimes colored with a pigment. The ink produced is waterproof, penetrates the parchment, and is difficult to erase, but acidic, and degrades paper.
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Category: Alchemical Symbols.
More symbols in Alchemical Symbols:
Alchemical symbols, originally devised as part of alchemy, were used to denote some elements and some compounds until the 18th century. Note that while notation like this was mostly standardized, sty… read more »