Understanding Hair Colour and pH

What does pH measure in a substance?

• The temperature

• The acidity or alkalinity

• The weight

• The colour

What is the pH range of healthy hair?

• 0 to 2

• 3 to 4

• 4.5 to 5.5

• 7 to 8

What happens to hair if the pH is too high?

• It becomes shiny

• It becomes dry and brittle

• It becomes stronger

• It changes colour

What is the pH level of pure water?

• 0

• 7

• 14

• 10

Which pH level is considered acidic?

• 0 to 6

• 7

• 8 to 14

• 10 to 14

What effect does an acidic pH have on hair colour?

• It makes hair colour fade

• It makes hair colour last longer

• It has no effect

• It changes the hair colour to green

What is the pH level of most hair dyes?

• 2 to 3

• 4 to 5

• 9 to 10

• 11 to 12

Why is it important to use a conditioner after colouring hair?

• To make hair smell nice

• To balance the pH and keep hair healthy

• To change the hair colour

• To make hair grow faster

What is the effect of using a shampoo with a high pH on coloured hair?

• It makes the hair softer

• It can cause the colour to fade

• It makes the hair grow faster

• It makes the hair curly

What should you do to maintain the pH balance of your hair?

• Use any shampoo

• Use products with a balanced pH

• Wash hair with hot water

• Use a lot of hair gel