Discovered : by Albertus Magnus in the 13th century Origin : The name comes from 'arsenikon', the Greek name for the pigment yellow orpiment. Description : Although it is now strongly linked with poison, arsenic was once used widely as a medicine. Dr Fowler’s Solution (potassium arsenate dissolved in water) was a popular cure-all tonic in Victorian times - even Charles Dickens used it. Arsenic compounds are still employed in making special glass and semi-conductors (gallium arsenice), preserving wood and, in some countries, to fatten poultry and pigs. Nowadays its use is strictly controlled, although some scientists claim it is an essential element in our diet in very low doses. Some foods such as prawns contain a surprising amount of arsenic. Image : Freshwater crayfish. See also Alchemical Symbols.