This is the complete guide to keeping blonde bright. The shorter guides linked through it go deeper on each question, and the blonde and foils page has the salon's prices.
Why blonde changes colour
Lightened hair is 2 things: the lift, which is permanent, and the toner over it, which is not. Lightener removes pigment and leaves the hair a pale yellow or gold. The toner is a sheer demi-permanent colour that turns that into the beige, ash, pearl or honey you chose, and it washes out gradually over 4 to 8 weeks. As it goes, the warmth underneath shows through again.
3 things speed that up: water (hot, frequent, or mineral-heavy), heat from tools, and UV from the sun. On the Coast all 3 are turned up in summer. The routine below slows each one, and the hair toner guide explains what the toner is doing in the first place.
Habit 1: wash less, wash cooler
Every wash lifts a little toner, and hot water lifts more. 2 washes a week in lukewarm water is the biggest change most blondes can make. Use a sulphate-free shampoo, condition from the ears down, and rinse cool at the end to close the cuticle. Dry shampoo at the roots on the days between keeps it feeling fresh, and it's kinder to the colour than a third wash.
Habit 2: purple shampoo once a week
Purple shampoo deposits a sheer violet that cancels yellow, which keeps a beige or ash toner reading true. Once a week, on wet hair, left for 2 to 3 minutes, then a proper conditioner. Used every wash it does the opposite: the pigment builds up, the blonde goes dull, and very light hair takes on a grey-lilac cast. The purple shampoo guide covers how much, how often, and when to switch to blue for darker bases.
Habit 3: heat protectant and a hat
Heat opens the cuticle and lets toner out, so a heat protectant goes on before every blow-dry, wave or straighten, and the tools run at the lowest heat that does the job. Sun does the same thing more slowly and all day: UV on the Coast is high through summer, and the daily UV index from NIWA is a fair guide to how hard it's working on your hair. A hat at the beach and a leave-in with UV protection through summer keep the toner in.
Habit 4: sort out your water
Auckland's town supply is soft, but many homes in Dairy Flat, Wainui, the rural edge of Silverdale and up towards Warkworth are on tank or bore water, and the minerals in it coat blonde hair, turn it dull and push it warm. Chlorine from the pool and salt from the sea do the same. A Malibu C treatment ($40) at the salon lifts the build-up at the basin before your toner goes on, so the toner takes evenly. If you're on tank water, a shower-head filter helps between visits.
Habit 5: top up the toner around week 6
However well you look after it, the toner softens at 6 to 8 weeks. A toner and blow-dry on its own is $150 and takes under an hour, and it's the visit that keeps a balayage or foil colour looking freshly done between the bigger appointments. The how long balayage lasts guide sets out the full rhythm.
When it's already warm
Yellow is a toner fix: a toner or gloss at the salon puts the cool back the same day. Orange, which shows up on hair lifted from a dark base, is a different conversation, because orange means the hair sits below the level a cool toner can hold, and the route is a lift and tone rather than a toner alone. The brassy hair guide explains which is which, and the colour correction page covers the bigger jobs.
What's on the retail wall
The Kérastase, Redken, Davines and O&M products the stylists use in the salon are on the retail wall, including the blonde-specific shampoos, masks and leave-ins. Buying the routine that worked in the chair, rather than a different brand's version of it, is the simplest way to get the same result at home.
The booking rhythm
Toner and blow-dry at week 6 to 8, the colour visit at 8 to 12 for balayage or 6 to 8 for foils, and a Malibu C before the toner whenever the water or the pool has been part of your summer. The blonde and foils and balayage pages have the menus, and every new client starts with a free 15-minute consultation.