pH is a measure of how acidic or alkaline a substance is:
Hair is not tolerant to extremes of pH, this is what happens to it as pH changes:
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By Heather Katsonga-Woodward
I was a natural hair blogger and mixtress living between London & Chicago from 2012 to 2017. I always thought I was 4C but some say 4B; images below - you decide! Heather xx