I've been interested in all the comments along the way about the properties of the solid shampoo bar. I'm not sure I'm up for formulating these myself and my biggest question is how will these bars work with color treated hair? I know that the key to not washing out color (especially reds) is using SLS free shampoos, so I assume you could not use this here either.
Who knows a non-stripping surfactant?
Who knows a non-stripping surfactant?