In this weeks Demo session we tested out four different strengths of peroxide with bleach on one head.
This was done by sectioning the head into four sections and using a different strength peroxide on each section, the strengths of peroxide being 3%,6%,9% and 12%.
Once the bleach was on we were then set the task of watching the hair colour go through the changes and try to identify the depths of the hair using a lightening curve.
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