Crocura martis, crocum Martis, croco Martis

Historical name
Description

CROCUS Martis is nothing else but a subtilising and Calcination of Iron, by means whereof it's tincture (which is most red in glass) is so opened that it communicateth it's self to glass, & not only manifesteth it self, but makes all other metalline colours (which ordinarily are hidden and dead in glass) appear fair and resplendent. (A treatise concerning the Art of Limning).

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