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Whether you’re a beauty novice or a confirmed fashionista, this topic is for consulting Mumsnetters on all things style-related. Plus, check out our Swears By page for the inside track on the next Mumsnet must-have.
What does it mean if the hairdresser says I have porous hair?
It's to do with the cuticle along the hair shaft. Usually because of chemical use. If it's too lifted (think scales on a fish) then the hair will be rough and any colour going in will come out easily. That's why red comes out quickly, the molecules are small so even people with non porous hair find red fades quicker than other shades. Here this is a decent diagram.