Alchemy

The first reference to alchemy, the search for an elixir of immortal life, was made by a Chinese Taoist in approx 140BC. These early alchemists were seeking to convert other metals into gold, not to create wealth, but as a step towards discovering the recipe for eternity. Among their experiments were an attempt to develop an immortality pill through refining mercury sulphide: The use of this poisonous substance lead to many deaths, including Tang emperors.