E-mail question: Thickening surfactant systems

In this post, Naomi writes…If I don’t have Crothix, could I substitute stearic acid? or Cetyl Alcohol? or another thickener – like Hydroxypropyl Methylcellulose? So, you add in Crothix for thickening purposes? What do you suggest as possible substitutes?No, you can’t use stearic acid or cetyl alcohol. They will eventually separate out and leave a…