Mercury

Mercury, called quicksilver by the ancients was used to make red mercuric oxide by heating the element in a solution of nitric acid. The reaction of quicksilver in nitric acid is striking as a thick red vapor hovers over the surface and bright red crystals precipitate to the bottom. Alchemists were convinced that mercury transcended both the solid and liquid states, both earth and heaven, both life and death. Mercury is one of the seven metals of alchemy (gold, silver, mercury, copper, lead, iron & tin). The symbol for mercury could also be used to represent the planet of the same name in astrology. The metal is often also represented by a serpent or snake.