Strengthening Clay Mask Strengthening Clay Mask for fine, weak hair. This cream has a soft, malleable texture and promotes tissue oxygenation. Red clay gently exfoliates the scalp, freeing pores of impurities. The iron and copper contained in the clay are precious mineral salts for una revitalizing action of the stem. The base containing glycerin provides emollience to the struttura of the hair. The softening and detangling action improves combability.