Barbicide

Barbicide is a disinfectant solution used by barbers and cosmetologists for disinfecting grooming tools such as combs and hair-cutting shears. Manufactured by King Research, it was invented in 1947 by Maurice King and marketed heavily around the United States by his brother James.
Barbicide is a United [States Environmental Protection Agency]–approved combination germicide, pseudomonacide, fungicide, and a viricide effective against HIV-1, hepatitis B, and hepatitis C. Its active ingredient is alkyl dimethyl benzyl [ammonium chloride] ; sodium nitrite and blue dye are also present.
Barbicide is sold as a concentrate diluted for use in a ratio of of Barbicide concentrate mixed into of water, with each stylist having a container for treating their own tools.
At one time, several U.S. states legally required barber shops to use Barbicide and according to the maker, two states continued to in 1997. A jar of Barbicide sits on display in the Smithsonian Institution's National Museum of American History.