Castile soap is taped in the Imports Book of the London port in 1567 and 1568. It is thought that this natural soap stemmed from the preparation of lye or salt carbonate from water and plant ashes, then boiled with olive oil instead of pet fats. In effect, they would boil the water with the ashes, then add the oils, and soap would float to the top where they would scrape it off. This technique produced hard white soap that solidify with age, while staying white. Producing the first of Jabon de Castilla.
So historically, this natural soap was olive oil, lye solution, and water. But today I see a great deal of mis-labeled soaps that have other oils in them. I do not know who makes these policies, however one site stated that as long as they had 80 % Olive Oil, they can label it. There is no governmental or regulatory body in soap making.
Provided, I have made this olive oil just soap, and it does not lather the method we are used to. It is called having creamy bubbles, which I expect is true, but those bubbles are so little, it can be called a creamy lather instead. When I initially utilized it, I though something was wrong with the soap, as it took some rubbing to obtain a percentage of lather, but that is how only olive oil soaps lather, or deficient there of. It is coconut oil in soaps that create those good big bubbles. And because of this, some soap makers add the other oils, such as coconut, so that there will be a lather.
If you are looking for a natural as possible soap, Castile would be a good option, and as a guideline, it would also be odorless.
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