there is not natural way to preserve products with water. I agree with ^^^ If i was so much into "natural" I would at least test it, in two or three days there would be significant growth of bacteria, fungi, and whatever can grow there. I make my lotion and soaps and everything for my own amusement, not selling and not going to.....
When I make eczema lotion for my granddaughter I am not going to risk it. I am not going to put on my face anything without proper preservation.
Dahlia, there are plenty of natural ways to preserve your soaps, if the right combination/concentration is used.
Catherine Failor, in her books for transparent and liquid soap making, illustrates several methods, but stresses that liquid soaps don't need a preservative because of their pH levels, along with the addtitives we used ie borax, alcohol, sugar, etc, for sequestering purposes. Susan, of Swift Crafty monkey, also indicates that liquid soap doesn't need a preservative, citing it's high pH factor. She does strees the absolute need of some type of preservative for other water based cosmetics, ie lotions and conditioners. Anne Marie, of Soap Queen, also states that liquid soap doesn't need a preservative.
As for honey, it is listed under many sources as a method of preservation in food and cosmetics.
Proven here: http://www.sciencedaily.com/releases/2008/12/081209125927.htm
And indicated in these articles, along with other natrual methods:
http://www.naturalcosmeticnews.com/new-ingredients/the-most-popular-natural-preservatives-2/
http://yellowstaressentials.wordpress.com/2010/03/25/natural-preservatives-for-cosmetic-recipes/
http://naturalhealthezine.com/natural-preservatives-for-homemade-beauty-products/
As well as the attached abstract, that is listed as a resource in this blog: https://suite101.com/a/honey-as-a-natural-preservative-a62853 . I have second one, from the Asian Pacific Journal of Tropical Biomedicine, however, the article is 6 pages long, however, here is a summary of the abstract: naturalhealthezine.com/natural-preservatives-for-homemade-beauty-products/. I do have it saved to my comp, for anyone who would like to read the full context.
As for there not being any other 'natural preservatives", Ingredients to Die for sells 2 natrually derived ingredients, and one being EcoCert. i don't know about other suppliers, i'm pretty sure there are plenty that sell presrvatives like those, but i haven't searched.
Look, I understand that preservatives are a big debate in the cosmetic world, but it will always go back to personal preference of the formulator. But to say that the ONLY options are synthetics, and all natural doesn't work, is completely inaccurate, and definitely misleading to a new soap maker/cosmetic formulator. Even FDA regulations on the matter say that so long as the method used works to their standards, when analyzed in a lab, then it is in fact, an effective preservative system. So if someone uses all natural methods to preserve rather than synthetics, or even naturally derived, like I use in my conditioner, and their products test within standards, then who is anyone to say that it doens't work at all?
View attachment Natural_Preservatives_original.pdf