Wella Mixing Ratios: Color Touch, Koleston & Illumina

What are the Wella mixing ratios?

Three Wella lines cover most salon work, and they do not share a ratio. Color Touch mixes 1:2 — one part colour to two parts Color Touch Emulsion — and it is a demi-permanent with its own emulsion, not a thinner Koleston. Koleston Perfect and Illumina Color both mix 1:1.

Weigh it out: Wella by the gram

Three lines, two ratios, and the one that trips people is the 1:2 — because the emulsion is the bigger number and the one that gets rounded down. Pick the line, type the grams of color you are about to weigh, and the emulsion or developer and the total mix come back at that line’s own ratio. Same rows as the table above, same arithmetic as the all-brand mixing ratio calculator.

What is the Wella Color Touch mixing ratio?

1:2 — one part Color Touch to two parts Color Touch Emulsion — and the reason it is not 1:1 is that it is a different product doing a different job. Color Touch is a demi-permanent: lower alkalinity, designed to deposit rather than lift, carrying a smaller dye load that has to spread evenly over a whole head. The extra liquid is what makes that spread possible.

It also takes Color Touch Emulsion, not a Koleston developer — 6 vol (1.9%) or 13 vol (4%). Processing is 20 minutes, not the 30–45 a permanent needs. The ratio is written colour-first: one part Color Touch, two parts emulsion, so the emulsion is always the larger share of the bowl.

The corollary matters too: a 1:2 mix is deliberately fluid, so Color Touch bleeds if you use it for fine root placement. That is the ratio working as designed, not a fault.

Color Touch 1:2 by the gram

1:2 is easy to state and easy to get wrong at the scale, because the emulsion is the bigger number and it is the one people round down. The rows below are the ratio worked out at the amounts a colourist actually mixes — the only figure from Wella here is the 1:2 itself; the rest is arithmetic.

Two things follow from the table. A full 60 g tube becomes 180 g of mix, which is more than most single-process applications need, so weighing out part of a tube is normal with Color Touch in a way it is not with Koleston. And if a bowl runs short, the top-up has to be mixed at 1:2 too — adding emulsion alone quietly turns the bowl into 1:3.

What is the Koleston Perfect mixing ratio?

1:1 — equal parts colour and developer. A standard 60 g tube takes 60 ml of developer, giving 120 g of mix. Processing runs 30–45 minutes.

The ratio does not change with the developer you choose. This is the part that trips people moving from a line where strength and ratio are coupled: with Koleston you change the developer volume to change the result, and the 1:1 stays fixed.

Which Koleston developer for which result?

• 10 vol. Tone-on-tone. Depositing at the same level, no lift.
• 20 vol. Gray coverage, or one level of lift. This is the default for most coverage work.
• 30–40 vol. Lift. Multiple levels, with the processing time to match.

What is the Illumina Color mixing ratio?

1:1, the same as Koleston — and it runs on Koleston or Color Touch developers rather than needing its own. Processing is slightly shorter at 30–35 minutes.

Because the ratio and the developers are shared, the practical difference between the two lines is what the result looks like, not how you mix it. If you can mix Koleston you can mix Illumina.

Every Wella ratio on this page sits alongside the other professional lines in the mixing ratio calculator — enter the weight of color you are using and it returns the developer to match. The three Wella times above are also in the processing time chart, next to every other line, for when the question is how long rather than how much.

How long do Koleston, Illumina and Color Touch process?

Koleston Perfect processes 30–45 minutes, Illumina Color 30–35, and Color Touch 20 minutes without heat, 15 with — the heat figure is from Wella’s Color Touch fact sheet, which is the only one of the three that gives a with-heat time. The clock starts when the last section is applied, not when the bowl is mixed.

The 20 is not a shortened 45. A demi-permanent at 1:2 with a 6 or 13 vol emulsion has done its depositing by then; leaving Color Touch the length of a Koleston service does not add lift, because there is no lift in it to add. The reverse mistake is the expensive one: pulling Koleston at 20 minutes on a gray head is how a 20 vol coverage service comes out translucent at the temple.

What changes for gray coverage?

Not the ratio. Koleston stays 1:1 and Color Touch stays 1:2 whatever the percentage of gray; what changes is which line you reach for and what you put in the bowl at that ratio. Wella’s own booklet maps Koleston Perfect at 20 vol to gray coverage, and its Color Touch fact sheet puts Color Touch at up to 50% gray — past that, a demi is blending, not covering, and the service belongs to Koleston.

The other variable is how much of the mix is a natural shade, and that tracks the gray percentage rather than the brand: the gray coverage math is worked through here, and the gray coverage calculator gives the natural-series split at each percentage. Whatever split you land on, weigh the whole bowl at 1:1 or 1:2 — the natural shade is part of the color, not an addition to it.

Do Wella high-lift shades change the ratio?

Across the industry, high-lift series generally move to 1:2 where their parent permanent line runs 1:1, because a 1:1 mix runs out of available peroxide before it has removed several levels of natural pigment. Lift stalls with the warm underlying pigment fully exposed, and the result reads brassy rather than merely lighter.

We have confirmed that pattern in manufacturer documentation for Majirel High Lift, Igora Royal High Lift and Topchic high-lift shades. We have not confirmed it for Wella's high-lift range against a current Wella document, so check the instruction sheet in the box rather than assuming Koleston Special Blonde follows the same rule. The cross-brand ratio table is here.

Which Wella ratio mistakes cost you the service?

• Color Touch on a Koleston developer. Wrong oxidant and usually wrong strength. Color Touch Emulsion exists because the system needs it.
• Koleston mixed loose to make it spread. Under- processing and failed gray coverage. Coverage needs dye density, and diluting moves you away from it. The gray percentage math is here.
• Topping up a bowl with developer alone. You have silently changed the ratio mid-service. Mix a second bowl correctly instead.