How a prosticity test is carried out in hairdressing?

A porosity test in hairdressing is conducted by taking a small section of hair and applying water to it. If the hair quickly absorbs the water, it indicates high porosity, meaning the hair cuticles are raised and the hair is more susceptible to damage. Conversely, if the water beads on the surface, it suggests low porosity, indicating tightly closed cuticles that may resist moisture. This test helps stylists determine the appropriate hair care and treatment products for their clients.