That's kind of technically correct, but in this context the solubility refers to how the silicone behaves once it's on the hair. Maybe for precision we should say 'water-rinsable' see the notes next to the headings in this post: http://science-yhairblog.blogspot.co...lity-list.html
[I did initially intend to say "it refers to how the silicone acts when bonded with the hair. Silicones are polar molecules and more strongly attracted to damaged areas of the hair because those are more charged. Water-soluble silicones are ones that should have that bond disrupted by water alone, whereas the others need a surfactant to wash them off, and almost always require a more effective surfactant than the fatty alcohols usually found at the top of the ingredients lists on conditioners".
HOWEVER I'm second-guessing myself on the bonds disrupting bit, and I'm not sure why I might make that up but I've just about used up all my brainpower this evening ]
Of course the formulation of the rest of every product will indeed affect exactly how the silicones behave and how the product works with one's individual hair chemistry - just like any other type of ingredient
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