The term green lion in alchemy was also called green vitriol or our green gum, green dragon among other names. In the alchemical writings of Theophrastus Paracelsus he indicated that when alchemists were at the alchemy stage called green lion, that they were not far from the “stone”. The term VITRIOL comes from latin and basically meant visit the interior of the earth and there by rectification find the occult stone. V.I.T.R.I.O.L( vitriol) Acronym. VITRIOL is an acronym for Visita Interiora Terrae Rectificando Invenies Occultum Lapidem which translated is “Visit the interior of the earth, and by rectifification find the hidden stone (philosopher’s stone)”. The “green lion of alchemy,” is said to be a poisonous substance that appears when metal is degraded by acid.
A page from an old alchemy science book circa 1786
The Philosopher’s Stone Book Alchemy by Steven School
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the philosopher's stone alchemy 