Addition of Stearic Acid will add opacity to candles. Stearic Acid will also harden the candle wax and acts as an internal mold release for molded candles. Typical concentrations are up to 10%.
At high concentrations, Stearic Acid may contribute to color fading and discoloration. Stearic Acid may be used to control the amount of mottling. Concentrations greater than 10% will typically prevent mottling.
Adding approximately half percentage may also help in fragrance release when a candle is solid.
Stearic Acid will also aid in fragrance holdout for container candles. Excessive use will generate soot when the candle is burned.