Caustic Discount

The practice of withholding caustic soda from a soap formula. After determining the amount of caustic soda needed to completely saponify the fats, only a percentage of the caustic soda is actually used. For instance, if a 7% caustic discount is desired, the amount of caustic soda is first calculated to completely saponify the oils/fats, then only 93% of the calculated amount of caustic soda is actually used; 7% is withheld.

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