Balsam is a type of pine, its less camphorous then regular pine, more sharp. I only used enough to give a different cool, sharp note to the peppermint. The menthol added a addition note too, its one of the best peppermints I've made.
Check brambleberry's facebook page for strong arm swirl, thats where I saw it. I don't know how its made but I hope to figure it out.
I just had a look at the strong arm swirls. I'm wondering if they get their name because they are poured really thick so they are difficult to mix? They are really pretty. I found a blog post about them, apparently they are hallowell soapworks signature design.