What is the purpose of porosity tests in hairdressing?

Answer 1

It can determine how well hair could take a perm or a color. The more porous the hair, the more damaged it is. The cuticles have been stripped away.

Answer 2

To see if the hair is absorbing a liquid that will dry it out and break it off or cause damage to the hair shaft itself. (baldness). The hair should be lubricated with a moisterizer or oil that protects the pores in the hair to prevent the damage of breakage.