Stearic Acid - Traditionally used as a thickening agent in lotion, this vegetable derived waxy substance is also used as a hardening agent in soaps (at a .5% usage rate). Stearic acid is also used as a hardening agent in candles, vegetable or paraffin based.
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Recently my parents were traveling in New Zealand (a favorite destination of theirs) when my Dad happened upon a little soap shop in Rotorua. His interest was peaked so he ducked in to take [...]