For over 150 years, Wright’s Coal Tar Soap was a popular brand of household soap; its successor, Wrights Traditional Soap, can still be bought in supermarkets and from chemists worldwide. The original product was developed by William Valentine Wright in 1860 from "liquor carbonis detergens", the liquid by-product of the distillation of coal to make coke; the liquid was made into an antiseptic soap for the treatment of skin diseases. However, Wrights Traditional Soap contains no coal tar, this having been replaced by tea tree oil for its antibacterial properties.