Clays are fine, naturally-occurring mineral particles, whose virtues and use can be traced back to thousands of years. imbued with purifying properties, they rid both skin and hair from impurities. Their remineralizing powers are multiplied when used for cataplasms. Diluted in bath water, they help to soften the skin. At Officine Universelle Buly, we celebrate colors such as: green, pink, white, yellow, ochre, red, lilac, orange and blue clays.