I use mostly French clays because I'm in France ...! And as I try to use only natural ingredients in my soaps, the colored clays are a good option to achieve some of the colors that I can't get with herbs, flowers, teas, etc. I find that clays really add to the cleansing properties of the soap, and they also seem to add to the creaminess of the lather. A lot of people believe that they also play a role in fixing the fragrance of EOs, but I can't swear to this.
My favorite, as someone with a "mature" (ahem!) skin is pink clay - because it's more gentle and less drying than green clay, so is suitable for mature or dry skin. Green clay is excellent for an oily skin, as it draws oils from the skin. Kaolin (white clay) is helpful to whiten/lighten the soap, and can be used for all skin types as it is mildly absorbent - as is red clay. I've recently ordered some Rhassoul clay, but haven't used it yet. But I've read rave reviews about it as a gentle exfoliant ...... So it's high on my soaping to do list!
Just a word of caution about making a soap specifically for acne - be aware that you will not be able to call it an acne soap or make any claims that the soap works as an acne treatment unless you do controlled clinical trials, and have the regulatory agency (FDA, or EMA in Europe) approve the product for this medical use.
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