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More than a hundred years after the publication of Basil Valentine's seminal work 'The Twelve Keys', Franz Clinge (1653-1732) wrote this detailed analysis and commentary on the work. He analyses the symbolism of the famous twelve engravings of Valentine's Keys, and their associated parabolas.
"It is taught how the Philosophers' Stone is to be prepared, according to the old, long way from common gold, and then according to the short way from philosophical gold."
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