cuticle
It is the cuticle.
The cuticle is the colourless outside layer of the hair. It lets chemicals in and out of the hair, chemicals such as shampoo and colours.
The innermost part of the hair (medulla) and the outside layer of the hair (cuticle) do not react with hair dye.
It is a strand of hair.
a strand test is carried out after applying colour to a hair. You remove the colour of a strand of the hair to check if you have the desired result (colour)
70,000 molecules in one hair strand ( average length, to shoulder)
talk to it
No that is a complete myth. A strand of hair is a very delicate thing.
a bulb
a bulb
a bulb