Superfatting (Lye Discount) is the key to creating gentle, moisturizing soap. It's the art of leaving some oils unsaponified to nourish your skin.
Using 0% Superfat is risky. A tiny measurement error could result in "Lye Heavy" soap that burns the skin. Superfat acts as a safety buffer first, and a moisturizer second.
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Our calculator does this automatically, but here is the logic:
High superfat (>10%) leaves too much free oil, which can oxidize and go rancid (Dreaded Orange Spots). To prevent this, add Vitamin E or Rosemary Extract (ROE) to your oils.