Porous hair absorbs hair chemicals very quickly and can become over process and damaged quickly. On thecontrary, hair that is not very porous does not absorb chemicals very quickly and can be difficult to perm or colour.
What is porosity ? And how can it affect hair color
Porosity tests are carried out to assess the condition of the cuticle layer of the hair.
Hair has different types of porosity. Porosity is the amount of moisture that the hair is able to absorb. There are a lot of factors that affects the porosity of the hair such as hair colors, perms, relaxers and other things. The more the hair is expose to these factors affects the overall porosity of the hair. The Porosity are Resistant porosity, normal, or extreme. Extreme porosity will relate to damaged hair that are unable to take color very well or it will fade faster or often. That means that the cuticle is missing and the hair is badly damaged.
The cuticle, which is the outermost layer of the hair shaft.
take small section of hair and push your fingers up the hair shaft if you feel bumps your hair is poroise
a porosity test is done while doing consultation with the client to show how much moisture the hair can absorb.
when dyed colour may not take and damage hair more
Where the porosity is greater
Porosity refers to your hair's ability to retain moisture. Hair that is highly porous has a raised cuticle that is both quick to absorb and lose moisture. Much highly porous hair is the result of overprocessing, and it is best to avoid chemical and heat processes on such hair in order to prevent futher damage. Instead, using protein treatments will help fill the gaps in the cuticle of porous hair.
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to test the hair to see if its damaged and able to have the treatment done, if the hair stands up once it have been pulled back by finger and the thumb then the hair is porus.
The reason why a porosity test is important is because hair that is more porous will "suck up" color more quickly than less porous hair. This being said, if the hair is not evenly porous, some parts may be darker than others and vice versa. To test the porosity, simply examine the quality of the hair in your hand. If the ends are severely brittle and porous, you might want to suggest a haircut after the service. Or, to make the porosity more even, apply a developer first, leave on for five minutes (don't wash it out), and then mix the desired color with developer and apply evenly.