UNIVERSAL HISTORY ARCHIVE / UIG / SCIENCE PHOTO LIBRARY UNIVERSAL HISTORY ARCHIVE / UIG / SCIENCE PHOTO LIBRARY
Mercury. Extracting mercury from ore by placing ore covered by sand and ashes in an earthenware pot on stand with a fire underneath. The mercury was retrieved from the bottom of the pot after cooling. From De la pirotechnia by Vannoccio Biringuccio (Venice, 1540).
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