For the alchemists of the Renaissance, it was a well established fact that mercury was to the metals as blood was to the body. Though the untrained knife would often bend or break while attempting to find untapped veins, a skilled practitioner could find a pulse within any ore, and draw forth a fountain of quicksilver with a single, well-placed incision. Every metal could be made to bleed this same lustrous ooze, from profane lead to sacred gold.