- Instead of animal fat, we can use vegetable oil (rapeseed, olive, flax, sunflower...) depending on the availability of the resource.
- It is possible to add essential oils in the preparation to have a pleasant smell.
- The soap obtained can be a little basic, therefore bad for the skin. To lower the pH, you can either add vinegar to the solution or mix it with clay powder.
- The quality of the ash influences the quality of the soap: apple ash, walnut shell ash or finely sifted oak ash gives a good quality soap. Burn the wood at a very high temperature also makes it possible to obtain a whiter ash and thus of better quality for the manufacture of soap.
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