Yes, a pure soap is a soap which consist only of fatty acids and alkali without other ingredients which aren't need chemically to make a soap. A pure soap, is needed I think, because of the abuse of impurities that lot of soap makers are making. For example, there are lots of "glycerin" soaps out there containing only 30 or 40 percent of soap, the rest is a filler, somewhat alcohol and sugars mixture. what about Waxes, paraffin, silicates, flour, and the list go on..
besides, when it comes to promote a "natural" benefit, there are folks out there pouring milk, vegetal parts, flowers, and lots of odds mixtures, that cannot put on the skin without extracting chemically the component useful. For example, lemon, vitamin C is good antioxidant, but the fruit irritate the skin like a burn.
You can always look at the items being sold for soap makers, the same laureth they argue commercial soap has, ingredients soap makers can buy are pretty the same as commercial soap , such as dove or any other. What about titanium dioxide.... I wonder, is it better to stop buying Dove to buy this experiments?! come on!... I would prefer always to have a commercial soap than to buy an expensive handmade experiment made for any person without any idea about chemistry.
Natural Soap is great, that is true, i have tried myself in a pure form, no impurities. About the rest of the impurities we may need a lab and a tester to know if that juice or the other is not going to harm badly our skin. if the juice someone tell us is "natural" wont make grow fungus or rotten...
Btw, you can get soap without impurities in www.onepuresoap.com if interested.
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Soap is "an anionic surfactant used as a cleansing agent, made from the salts of vegetable or animal fats". It is produced by treating a fat or oil with an alkaline substance. For information about its history and chemistry, I'd suggest reading http://en.wikipedia.org/wiki/Soap"Pure" isn't well defined, because which fat/oil and which alkali are used can vary. I'd say a pure soap is simply one which doesn't add any other ingredients, where those two are purified before being mixed, and where the amount of the two ingredients is balanced so there's just enough alkali to convert all the oil/fat to soap.If you told us why you needed to find a "pure soap", that might help us answer the second part of your question.
thanks for your reply you seem to know a great deal about soap.thanks.
http://en.wikipedia.org/wiki/Soapsoap, in its purest form, consisting of sodium (soda ash) or potassium (potash) salts of fatty acids is obtained by reacting fat with lye in a process known as saponification. The fats are hydrolyzed by the base, yielding alkali salts of fatty acids (crude soap) and glycerol.