I'm looking to add a little menthol to my next batch and I'm fully aware that the feel of menthol is subjective to individuals but since this soap is for me I'm looking to see how it feels. I'm not looking for a very strong menthol, just enough so it gives a light, cooling sensation. My question is about adding the menthol. Do I add to the FO and add the mix as usual? Do I add to the oils after/before lye water? Do I add to lye water? I'll be working with menthol crystals that will dissolve in water or oil and any advise will be appreciated.