How to make a clay face mask with French blue clay. Learn 6 DIY blue clay mask recipes for glowing skin! These hydrating blue face mask ideas are gentle and a wonderful at-home skin care treatment for dry skin. A homemade hydrating face mask with blue clay is easy to make. Only 5 minutes prep is needed to make a DIY face mask, and this simple all-natural beauty recipe is cleansing, hydrating, exfoliating and rejuvenating.