February 12, 2013 by thesoapalchemist
One of the most elusive natural colors to achieve in a bar of soap, is blue. After years of searching for a natural blue, I discovered Cambrian Russian Blue Clay, and found that it creates exactly the baby blue to soft gray hues that I’ve longed for.
Listing it on our ingredient labels, however, presents an interesting conundrum. Relatively new to the cosmetic world, blue clay is mined in Russia, Estonia, and Czechoslovakia, among other places, and contains a mixture of several different clay minerals including (but not limited to!) illite, montmorillonite and kaolinite. INCI terminology is becoming the accepted nomenclature for ingredients, and to the best of my knowledge, does not have a name for “Blue Clay.” So how should Cambrian Russian Blue Clay be listed on our soap labels?
I found the following paper, written in 1963, interesting, and thought I’d share it with my fellow soapers.