Q&A: Can we add oil soluble botanical extracts to conditioner bars? Part one, determining the charge of a botanical extract

In this post, Weekend Wonderings: All about conditioner bars, Rick asks, I have been reading through the “Conditioner bars you will love” book and am thinking about adding some “botanical extracts” to see if they improve the bars. Here’s my first questions: 1) How do you tell if an extract (or any ingredient, for that…