Walnut Shell Powder: ground walnut shell you mix into an exfoliating scrub for body and face. Moved lightly over damp skin, it buffs away dead surface skin, so rough, flaky areas usually feel smoother after rinsing. For the body, use 1–2 tablespoons with lukewarm water, about 3–5 minutes in all; for the face, if your skin is comfortable with scrubs, ¼ teaspoon in a creamy base such as plain yogurt, featherlight, for under a minute. Once a week is enough. It isn't for anyone with a walnut or tree-nut allergy. How to use walnut shell powder has every method. Orange Peel is a mask, not a scrub, so it's in face masks. Patch test 24–48 hours before first use.