Soda ash is sodium carbonate and too much sodium in soap makes the soap harsh on the skin. Soda ash is a weak base added to increase the size of laundary soaps.
A bathing soap (Toilet soap) must have more of potassium salt and little of sodium. Factory formulated Toilet Soaps contain Potassium Hydroxide and this gives you that gentle feel in the bath room ~ unlike sodium soaps that we use for laundary. By standard, a Toilet soap should have pH of about 9 while Laundary is 10. Total Fatty Matter in Toilet Soap should be up to 75percent. The standard is indeed high for Toilet soap because it is used to take care of the largest organ of the body ~ the skin.
While fillers, bulking agents, foaming agents and hardeners, like soda ash, kaolin, SLS/Sulphonic acid, Silicate, and Calcium Carbonates, are permitted in laundary soaps, you must never put them in bathing soap. A bathing soap must be as natural as possible.
An improperly prepared bathing soap may not have effect today but that is cancer (especially cervical) and other dermatological disorder waiting for the future.
Use only oils and alkali to make your bathing soaps. Add perfumes and colours that are not carcinogenic. Palm Kernel Oil alone is not suitable for bathing soap ~ you need superfat. Blend the oil with Palm Oil, Coconut Oil or Sheabutter. Caustic soda alone is not suitable add potassium hydroxide. Formulate it well. The glycerol must be intact. Give it time to cure.
A toilet soap must be gentle, soft, and supple.
From: Odfid Technical Center
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