Between 8.5 and 9. Permanent colours are alkaline.
Phenol red is a red color at neutral pH. It changes color depending on the pH of the solution it is in.
The color of the paper changes based on the acidity or alkalinity of the solution it is dipped in. By comparing the color of the paper to a pH color chart, the pH of the solution can be determined.
Soy sauce typically has a pH of around 4.0 to 4.5, which falls within the acidic range. The color of soy sauce is usually dark brown, and the pH of the sauce does not affect its color.
Using a UI indicator solution, or UI paper, pH 6.7 corresponds to a yellow/green colour
This is a pH indicator.
There is permanent hair color and semi-permanent hair color. _____________ Demi permanent and temporary are also known as non permanent hair color.
I believe the pH differs in haircolor by brand and whether it's permanent, demi permanent, semi permanent, or temporary.
Yes, it's fine to apply permanent color over semi permanent.
what is the importance of restoring the ph levels of the hair after permanent colouring sevices
Yes.
Phenol red is a red color at neutral pH. It changes color depending on the pH of the solution it is in.
Yes, you can apply permanent hair color on top of semi-permanent hair color. Make sure that you do a deep conditioning treatment or hair masque before and after you color your hair.
That depends on the pH.
Of course you can. Semi permanent dye simply adds color to your hair. A permanent will actually cause your natural color to change. But remember this... color doesn't lift color. Therefore if your semi permanent hair color is darker than the permanent color you are going for---- it isn't going to work. You need to use a color remover before hand. And color removers are REALLY damaging to hair.
9.0 to 10.0
The color of the paper changes based on the acidity or alkalinity of the solution it is dipped in. By comparing the color of the paper to a pH color chart, the pH of the solution can be determined.
If the scalp is in good condition and was not irritated by the semi permanent color, it's OK to apply permanent color within 24 hours after initial color service.