Multanni Mitti is a form of Fuller's earth. Fuller's earth is any clay material that has the capability to decolorize oil or other liquids without chemical treatment. This product is 100% pure and natural treatment for tanning and pigmentation. Its also effective in treating sunburn and skin rashes & completely skin friendly. Multani Mitti Face Pack for Oily Skin. Say goodbye to oily skin: Rich in magnesium chloride multani mitti helps reduce acne and remove blackheads. To a tablespoon of multani mitti add a teaspoon each of sandalwood powder rose water and milk. Mix them and apply the mixture to your face.