Since the 19th century, horn buttons have been used in Europe, America and Africa. Most of the horny buttons are black or dark, and light colors (such as beige and orange) are rare. Horns, buffalo horns, and sheep horns collected from slaughterhouses are widely used to make buttons, a practice authorized by the Washington convention. The angular Angle of the animal was first adopted by the famous Haute Couture company. Today, bone buttons are reusable products.