Where the Pigment Sits
Permanent colour deposits pigment in the cortex, the inner layer. To get there the cuticle must open, and that happens in an alkaline environment.
Afterwards the cuticle closes, but never quite as it was. It is through those microscopic gaps that pigment escapes gradually with every wash.
Why some colours fade faster
Red pigments have larger molecules that are held less securely and leave first. Which is why red hair needs refreshing most often, whatever brand of colour you use.
What Speeds Fading Up
Hot water, because it opens the cuticle. Frequent washing, because every rinse takes a little pigment. Strong shampoos, because they strip more of the surface layer.
And the sun, which breaks pigment down directly. If you spend long periods outdoors in summer, colour will fade faster than in winter with otherwise identical care.
What Genuinely Extends Colour
Lukewarm water for washing and rinsing. That is the simplest and most underrated measure, and it costs nothing.
Washing less often, as far as your scalp allows. Dry shampoo between washes is a practical compromise, provided it does not build up on the scalp.
And waiting after the appointment. For the first couple of days the cuticle is still settling, so delaying the first wash helps more than most colour-protection products.
Shampoos for Coloured Hair
Their main difference is the surfactants: milder, which means less stripping. That is a real advantage but not magic. How to read the label is covered in our shampoo guide.
A colour-protection claim is not regulated and guarantees nothing on its own. The ingredient list is a better guide: avoid sulfates high up if your colour fades quickly.
Toning Products
Purple and blue products do not restore colour; they neutralise an unwanted tone visually. Purple corrects yellow, blue corrects orange. The mechanism is covered in our article on violet pigments.
Overuse leaves a greyish or lilac cast, particularly on very light, porous hair. Once a week is enough for most people.
Realistic Expectations
Permanent colour holds noticeably for around four to six weeks, after which it visibly shifts. That is normal and does not mean the appointment went wrong.
No product stops fading entirely. Good care slows it and keeps hair in a state that tolerates the next appointment better, which is the more important part.
Coloured Hair and Sun
Ultraviolet light breaks down pigment directly and damages the protein in the strand at the same time. The result is twofold: colour fades and hair turns coarser.
A hat during long sun exposure does more than any hair product with a UV filter. Salt water and chlorine speed the process up too, so rinsing with fresh water straight after swimming is worthwhile.
Maintaining Between Appointments
Pigmented refresh masks add colour at the surface and stretch the interval between appointments. They do not replace colouring, but they slow the visible shift.
Be careful with quantity and timing, particularly on light, porous hair, which takes pigment up very quickly and unevenly. Start with less time than the packaging suggests.
Hard Water
In hard-water areas minerals deposit on the surface of the strand. That dulls colour, adds a yellowish or greyish cast and makes combing harder.
A clarifying shampoo every few weeks removes the build-up. More often than that strips pigment as well, so the balance matters.
Before the Appointment
Do not wash your hair immediately before colouring. The natural layer of sebum on the scalp reduces irritation, and slightly unwashed hair takes colour no worse than freshly washed hair.
Tell your stylist what you have done to your hair over the past year, home colour and straightening included. Some processes do not combine well, and that is not visible at a glance.
In Short
Lukewarm water, washing less often, a mild shampoo and sun protection do more for colour longevity than any specialist product.
Fading is inevitable. The goal is not to stop it but to slow it enough that the next appointment comes less often and your hair handles it better.
