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[Ingredient with INCI Name:] Sodium Stearate [Purpose of Ingredient:] This product is used as a emulsion stabilizer and opacifying agent. [About the Ingredient:] 
Sodium Stearate is the salts of the fatty acids of Stearic Acid. It is a soap and is used in the formulation of bath soaps and detergents.
Soap & Detergent: What is the difference? | Adventures With The Sage
About the Ingredient: