Why toner went purple, and the fix

The three usual causes

1. More violet than warmth. Violet can leave a visible violet cast when its deposit exceeds the warmth available to neutralize. V and VV have no background color: they’re pure reflect.
2. Porous ends. High-porosity hair grabs more pigment, so the ends go deeper and more violet than the rest.
3. Too much violet for the canvas. A level 10 shows only pale yellow, so it usually needs much less violet than a level 9 or 8.

Fixing it today

A carefully selected warm formula may rebalance excess cool tone; strand-test because additional deposit can change depth and reflect.

Gold-containing formulas may help balance excess violet. Gold Rose (GRO) is a gold-and-rose reflect for warm, rose-tinted results, not a universal purple fix: it still deposits, so it can change depth and add pink. It can be used as an additive in a re-gloss.

The GRO shades (010GRO Sparkling Wine, 09GRO Blush Spritz, 07GRO Golden Fizz) are Bonder Inside only.

Preventing it next time

• Adjust the violet shade, concentration and background to the canvas and desired result. Adding a natural background shade such as N, NW or GB (for example, 09V + 09N) can help control the result, but it is one formulation choice, not a requirement.
• Choose the application order for the zones. Porous ends often go on last, or dilute the ends formula with 000 Crystal Clear.
• On level 9 and 10 hair the shades already carry the least pigment, so it’s often better to choose a lighter shade than to add a lot of Clear.
• Strand test, and adjust the formula to how the hair responds.