Most advice about coloured hair stops at "use a colour-safe shampoo". That is the right product decision, but the product is maybe a third of the outcome. How often you wash, how hot the water is, where you put the shampoo, how you dry it and what happens on the days in between all move the needle, and none of them cost anything.
This is the routine, in order.
Start with the first few days after colouring
Freshly coloured hair is the most vulnerable it will ever be. The cuticle has been lifted to let pigment in and takes time to settle back down, and colour molecules are still working their way into place. Most colourists advise waiting a couple of days before the first wash, and there is a straightforward logic to it: every wash in that window costs disproportionately more colour than a wash a fortnight later.
In practice: delay the first shampoo as long as you reasonably can, and when you do wash, treat that first wash as the gentlest one of the cycle. Cooler water, minimal product, no clarifying shampoo.
How often should you actually wash?
There is no universal number, because the right frequency depends on your scalp, not your colour. What is true for everyone is that each wash costs a little colour, so the question is how few washes you can get away with while keeping your scalp comfortable.
- Fine or straight hair shows oil at the roots fastest, because sebum travels down the shaft easily. This group usually needs the most frequent washing and gets the most benefit from dry shampoo.
- Thick, wavy, curly or coily hair can typically go considerably longer between washes; the oil does not travel as readily and the hair is generally drier to begin with.
- Oily or flaky scalps should not be left unwashed to preserve colour. Scalp health comes first; a neglected scalp causes problems that outlast any colour.
- Frequent exercise does not automatically mean frequent shampooing. Rinsing with water and conditioning the ends removes sweat without stripping much colour.
Stretch your interval gradually rather than all at once. Adding one extra day at a time gives your scalp a chance to adapt.
Water: temperature and hardness
Hot water encourages the hair cuticle to swell and open, which lets pigment escape and moisture with it. Warm-to-lukewarm for washing, and a cool rinse at the end, is the whole rule. The cool rinse is uncomfortable in winter and worth doing anyway, at least over the lengths.
Hard water is the factor most people never consider. Mineral deposits build up on the hair over weeks, leaving colour looking dull, flat or subtly off-tone, and making hair feel rough no matter how good the conditioner is. If you live in a hard water area and your colour keeps going dull rather than fading evenly, consider an occasional chelating or clarifying wash to lift the mineral build-up, and a shower filter if the problem is persistent. Use clarifying shampoo sparingly, though, because it also strips colour: think occasional reset, not part of the routine.
The wash itself, step by step
- Detangle before you get in. Wet hair stretches and breaks more easily than dry hair. Comb through gently, from the ends upward, before the shower.
- Rinse thoroughly first. A proper rinse removes a lot of surface dirt and sweat on its own and means you need less shampoo.
- Shampoo the scalp, not the lengths. This is the single most useful change most people can make. Use a small amount, emulsify it between your palms first, and work it into the scalp with the pads of your fingers, not your nails. The mid-lengths and ends get cleaned by the suds running down during rinsing, which is all they need.
- One wash is usually enough. Double-shampooing is for heavy product build-up, not for a normal week.
- Rinse completely. Residue leaves hair dull and flat, which reads as faded colour even when it is not.
- Condition mid-lengths to ends. Squeeze excess water out of the hair first, otherwise you are diluting the conditioner. Leave it on for a couple of minutes rather than rinsing straight away.
- Finish with a cool rinse. Then squeeze water out of the hair with your hands before you reach for a towel.
Masks, treatments and not overdoing it
A deep conditioning mask once a week, in place of your usual conditioner, is enough for most people. Coloured hair benefits from moisture, and if the hair has been lightened it may also benefit from a strengthening or bond-repair treatment. Do not stack every treatment you own into the same wash: hair that gets too much protein and too little moisture goes stiff and brittle, which people then misdiagnose as damage requiring even more treatment. If your hair starts feeling rigid and snappy rather than dry and rough, ease off the protein and lean on moisture.
A leave-in conditioner or light oil on the ends after washing is worth the thirty seconds. Ends are the oldest, most porous part of your hair and the first place colour looks tired.
Drying and heat
- Do not rub with a bath towel. Squeeze and blot with a microfibre towel or an old cotton t-shirt; rubbing roughs up the cuticle.
- Let hair air-dry partially before any hot tool. Blasting soaking-wet hair with high heat is the most damaging thing in a normal routine.
- Always use a heat protectant before a dryer, straightener or curling iron, and let it dry before the tool touches the hair.
- Use the lowest temperature that gets the job done. Most straighteners run far hotter than most hair needs.
- Finish a blow-dry with a cool shot; it helps set the cuticle flat.
Between washes
- Dry shampoo at the roots buys you an extra day or two. Apply to the roots only, let it sit a minute before brushing through, and make sure it comes out fully on wash day; build-up causes scalp irritation.
- Silk or satin pillowcases create less friction overnight than cotton, which means less roughing of the cuticle and less morning frizz.
- Sleep with hair loosely tied, in a loose plait or a soft scrunchie, not a tight elastic that creates a stress point.
- Brush gently and less. Use a brush designed for wet hair if you must detangle damp, and always work from the ends up.
Sun, chlorine and salt water
UV exposure breaks down colour pigment, so a hat is the simplest protection there is, backed up by a leave-in with UV filters on long beach or garden days. For swimming, the trick is to get your hair saturated before it goes near the pool: wet it thoroughly with clean water and work in a little conditioner or leave-in first, so the hair has less capacity to absorb chlorinated or salt water. Rinse as soon as you get out rather than letting it dry in. Blonde and lightened hair is the most vulnerable to discolouration from pool chemistry and deserves the most care here.
A workable weekly rhythm
- Wash days: colour-safe shampoo on the scalp, conditioner on the lengths, cool rinse, heat protectant if styling.
- One wash day per week: swap the conditioner for a deep mask and leave it on longer.
- Non-wash days: dry shampoo at the roots if needed, minimal heat, protective sleep setup.
- Occasionally, not weekly: a clarifying or chelating wash if you have hard water or heavy product build-up, followed immediately by a deep conditioner.
- Every six to eight weeks or so: a trim, because split ends travel upward and no product reverses them.
Troubleshooting
- Colour fading unusually fast: look at wash frequency and water temperature first, then at whether your shampoo is genuinely sulfate-free.
- Dull rather than faded: usually product or mineral build-up. A single clarifying wash plus a mask often fixes it.
- Brassy or warm tones appearing: common in lightened hair; a toning shampoo used occasionally, not daily, is the usual answer.
- Dry, rough ends: more moisture, less heat, and a trim.
- Stiff, brittle, snapping hair: likely too much protein. Pause strengthening treatments and use moisture only for a few weeks.
- Itchy or flaking scalp: do not stretch washes further; treat the scalp. Persistent irritation is worth a pharmacist or doctor's opinion.
What to keep on hand
The short list is a sulfate-free colour-safe shampoo, a matching conditioner, a weekly deep mask, a heat protectant, and a microfibre towel. Everything else is optional. All Care Store's bathing, personal hygiene and personal care range and skin care and beauty range cover the shampoo, conditioner and scalp care basics.
Related reading
For the chemistry behind all of this, including why colour fades and what a colour-protecting shampoo is actually doing differently to a standard one, read maintain the colour of your hair with a colour-protecting shampoo.
