I would really like to try orris root or benzoin, experiment with things like that, but I keep reading that they are sensitizers...you don't think it's a problem in soap? So far my family and friends are enjoying my experiments..I would be mortified beyond belief if my soap gave someone a rash or some such thing. Maybe it's not worth the risk..I am a little mystified, though, as I know there are some pretty big alameda out there that use these types of fixatives.