"300 years ago, in 1696, living in Hambourg, the german alchimist Henning Brandt, like most congeners, tried to produce gold. He let urine in a bath tub for several days, vaporized it, heated the sticky stuff he obtained and mixed the vapors with water, where they were supposed to be transformed to gold. Much to his surprise, he obtained a white matter, like wax, shining in the dark." Brandt had discovered phosphorus. That was a chemical transformation.
- A.D.F. Toy and E.N. Walsh: Phosphorus chemistry in everyday living, 2nd. ed.(Washington: ACS, 1987)-