sulphur In Alchemy, a Symbol of the masculine principle. Sulphur coagulates liquid MERCURY (feminine), thus “fixing” it. It represents the fiery, active principle: the SUN, the DRAGON or OUROBOROUS, and also the Prima Materia. Paracelsus said that sulphur and SALT are the parents of mercury, which is the child of the sun and Moon. See also TRIA PRIMA.