Blonde is the highest-maintenance colour there is, and the gap between appointments is where most of it is won or lost.
Brass is a water problem as much as a hair problem
Warm tones creeping back into cool blonde is partly oxidation and partly minerals in your water. In hard-water areas the effect is faster and more stubborn. A violet shampoo neutralises the yellow, but the trick is restraint - once or twice a week is plenty. Left on too long or used every wash, violet pigment builds up and leaves blonde looking flat and slightly grey.
Heat is what actually breaks it
Lightened hair has less internal structure to begin with, so it tolerates heat far worse than virgin hair. If you change one thing, make it this: use a heat protectant every single time, and drop your styler temperature. Most people run their irons 30 - 40°C hotter than they need to. On bleached hair that difference shows up as breakage within a few months.
Keep the moisture and protein in balance
Bleached hair is porous - it loses water quickly and drinks up whatever you put on it. It needs both moisture and structural support, alternated rather than piled on. A rough weekly rhythm that works for most people: one moisture mask, one bond or repair treatment, violet shampoo once or twice, and a leave-in on damp hair every wash.
Between-appointment kit
- Violet shampoo - for tone
- A rich mask - for moisture
- A bond treatment - for structure
- Heat protectant - non-negotiable
- A leave-in or oil - for the ends
None of it replaces a good stylist. It just means they're working with hair that's still in decent shape when you come back.