The juice of grapes or wine is the aqua permanens or mercurial water, also known as the alchemist’s secret *fire. Hoghelande’s De alchemiae difficultatibus stated: ‘Man’s blood and the red juice of the grape is our fire’
Abraham establishes that in alchemical imagery the grape’s pressed juice is a primary symbol for the aqua permanens and the secret fire, the transformative mercurial agent at the heart of the opus.
, A Dictionary of Alchemical Imagery, 1998thesis