Debyjay, this might help you understand better how the acidity or alkalinity of products affects our hair so that you aren't afraid to try the ACV. But remember, everything in moderation. Too much acid isn't a good thing either.
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pH and hair
The key to the perming process lies in the fact that perming solution is alkaline. What exactly does this mean in relation to hair?
When scientists talk to each other about alkaline solutions and acid solutions, they need a way of measuring alkalinity and acidity. The scale they use for their measurements is called the pH scale.
The pH scale ranges from pH 1 to pH 14. All you need to remember is that acids have pH numbers less than 7. Alkalis have pH numbers greater than 7. The more acid the solution, the lower is the pH number; the more alkaline the solution, the greater the pH number.
pH is measured using special indicator papers which change color when the pH changes.
Hair responds to changes in pH.
If a hair is placed in an alkaline solution it swells, and the scales of the cuticle lift. In a slightly acid solution, the scales lie smoothly and the hair is soft. In a strongly acid or alkaline solution, however, the keratin protein starts to break down.
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(Taken from World of Hair )
And this fact that acidity makes the scales of the cuticle lie flat further explains why an ACV rinse makes your hair shine.