Goldwell Mixing Ratios: Topchic 1:1 and Colorance 2:1

What are the Goldwell mixing ratios?

Topchic mixes 1:1. Colorance mixes 2:1 — and that 2:1 is written lotion-first, not colour-first. It is the only line in the major-brand table that reverses the usual direction, and reading it the normal way round gets you a mix with half the liquid it needs.

Why is Colorance written 2:1 and not 1:2?

Because Goldwell states it developer-first. 2:1 means two parts Colorance Lotion to one part colour. Almost every other line in professional colour writes the ratio as colour : developer, so a colorist moving to Goldwell reads "2:1" and reaches for twice as much colour as lotion.

That misread is not a near miss. It inverts the mix: you end up with 40 ml of colour to 20 ml of lotion where the product wanted 40 ml of lotion to 20 ml of colour — a stiff, over-pigmented mix at roughly a quarter of the intended liquid, on a demi that was designed to spread thinly and deposit.

What ratio does Topchic mix at?

1:1 — equal parts Topchic colour and Topchic Lotion, processing 30–45 minutes. Unlike Colorance, this one is written the conventional way round, which is part of why the pair catches people: two lines from the same manufacturer, stated in two different directions.

Which Topchic Lotion percentage?

• 3% — roughly 10 vol.
• 6% — roughly 20 vol.
• 9% — roughly 30 vol.
• 12% — roughly 40 vol.

Percentage and volume are two scales for the same thing: percentage is peroxide by weight, volume is how much oxygen a unit will release. The conversion is a factor of about 3.3, which is why the familiar 10 / 20 / 30 / 40 vol ladder maps onto 3 / 6 / 9 / 12%.

What does 2:1 look like in the bowl?

1. Start from the colour, not the total. A 60 ml Colorance tube needs 120 ml of Colorance Lotion, giving 180 ml of mix.
2. For a partial tube, halve both sides. 20 ml of colour takes 40 ml of lotion — the quantity Goldwell publishes.
3. Scale both halves together. Never add lotion alone to stretch a mix that is running short. That silently changes the ratio part-way through the service.

Processing is 20–30 minutes, shorter than Topchic's 30–45. That is the normal demi/permanent split: Colorance is depositing, not lifting, and it does not need the time a permanent needs to complete oxidation.

Do Topchic high-lift shades change the ratio?

Yes. Topchic high-lift shades move to 1:2 where the standard Topchic range runs 1:1 — one of the three high-lift ranges the 1:2 pattern is confirmed for, alongside Majirel High Lift and Igora Royal High Lift.

The reason is mechanical rather than stylistic. A high-lift shade has to sustain an oxidising reaction for the 45–50 minutes it takes to strip several levels of natural pigment, and a 1:1 mix exhausts its available peroxide before it gets there. The result is not slightly lighter — it is under-lifted and brassy, because lift stalled with the warm underlying pigment fully exposed. What that exposed warmth is, and how to neutralise it.

Which Goldwell ratio mistakes cost you the service?

• Reading Colorance 2:1 as colour-first. The single most expensive misread in this brand. You get a quarter of the intended liquid on a demi designed to run thin.
• Assuming Topchic and Colorance share a direction. They do not. Topchic is colour-first at 1:1; Colorance is lotion-first at 2:1.
• Running Topchic high-lift at 1:1. Lift stalls part-way and the exposed warmth reads as brass.
• Substituting a generic developer for Colorance Lotion. The system is built around its own lotion. The cross-brand ratio table is here.