Kaolin clay INCI: Kaolin. Our Kaolin Clay is BP grade (pharmaceutical) which has been sterilised for increased purity and is more expensive than other grades of Kaolin however we think that only the best should be used especially on the face. An off white light fluffy powder with a silky feel. Due to the lightness of Kaolin you will find that 100g of clay will fill a 250ml jar so a little looks like a lot. Kaolin Clay. This white clay is suitable for use in soap, bath bombs, face masks, sugar scrubs and a wide range of cosmetics. INCI Banding: Kaolin: 98.8% Tetrasodium Pyrophpsphate: 0.2% Water: 1%