I didn’t know the extend to which vanilla is reactive in cold process soap in particular. I say in particular because I also made a hot process soap with the same ingredients and it was less reactive. I made cold process soap with vanilla. Let me put it as I have it listed on here, Vanilla Ylang Ylang Coconut Soap (100 percent Coconut Soap). Yes this soap. From the moment I made it I said this one is different. Because I have made 100% Coconut Soap but without fragrance. Even though I use only essential oils in my soaps; this was different. The mixture had no major difference than at other times I made it but when left in the mold for safonication it came out with some outer discoloration as I would put it. And after unmolding and cutting the soap got more and more darkened. I have since found it to be quite beautiful.