Why superfat soap?
One other big reason to superfat natural soap especially cold process soap has to do with the soap's pH and its drying effects on the skin. Regular cold process soap, though a natural product has a high pH (9.5). Skin on the other hand has a low pH (4.5-6) in the acidic range. The difference between the low pH of skin and high pH of natural cold process and this incompatibility is what causes soap to be drying to the skin. In order to make soap more compatible with our skin's pH we should superfat natural cold proces soap by adding fatty acids (oils).
Since normal skin is usually around 4-6 on the pH scale, having soap that is considerably above that level can be a big deal especially when we consider that certain skin conditions flourish at higher pHï¿½s (alkaline) than at acidic levels <7.5 . One example of these conditions is P.acnes which is a gram positive bacteria found on all skin but proliferates in larger numbers on skin that is more alkaline. Conversely, if the pH of the skin is lowered through topical application or soap products that are closer to the natural acidic pH of skin then, these numbers fall.
Another way to correct the pH of soap to be more compatible with the skin's pH is to cook the soap. The hot process method produces soap that has a lower pH and thus is milder to use than soap that is cold processed. In addition, any method that uses half cook/ full cook method will be gentler to the skin than full cold process soap.
Information for this article obtained from the following source
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