How will I know if the soap I made can be tested on human skin? and If it will not make allergic reactions.
As long as the recipe you used contains the right amount of lye and you followed it correctly, your soap should be fine to use after the 4 - 6 week cure time.
As the soap cures it becomes more gentle on the skin. After a couple of weeks you can test the soap but it will probably be quite drying until the cure time is complete.
People are allergic to very different things and you cannot predict what a person may or may not be allergic to. If a person is allergic to a soap it is usually because they are allergic to one or more of the ingredients in the soap and not the soap as a whole.
You can test some of the ingredients by rubbing small amounts of them on sensitive areas of the skin (inside elbow) and leaving it for 24 hours to see if there is a reaction. This can be done with the base oils and with essential/fragrance oils that have been diluted in a carrier oil.
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