Hair Color Developer: Choosing Volumes

Developer is half the equation in hair coloring. Choosing the right volume is just as important as selecting the right dye. This article is part of our complete guide to hair colorimetry basics.

Quick summary: Hair color developers come in 4 volumes: 10 vol (deposit only, no lift), 20 vol (gray coverage, light lift), 30 vol (highlights and dark bases) and 40 vol (the highest lifts, high damage risk). How many levels each one lifts depends on the line: on Schwarzkopf’s US Igora Royal chart, 20 vol lifts 1-2, 30 vol 2-3 and 40 vol 3-4 with the 10- series; Wella’s Koleston Perfect usage guide gives 2 levels at 30 vol and 3 at 40 vol on its 1:1 mix. The professional rule is always use the minimum volume that achieves the goal.

What is developer and how does it work in hair coloring?

Developer (also called activator, oxidizer, or peroxide) is hydrogen peroxide in a cream or lotion, at different strengths. It is mixed right before application: with the dye in permanent color and with the lightener when bleaching. In permanent color, within the same line and the same mixing ratio, the stronger it is, the more the mix lifts. Strength is measured in volumes or as a percentage of H₂O₂; how many levels each volume gives is set by each line’s own guide (below, Igora Royal’s US guide and Wella’s Koleston Perfect usage guide).

What volume of developer lifts how many levels?

Lifting power is published by each house for its own line. Schwarzkopf’s US developer guide for Igora Royal gives 10 vol (3% H₂O₂) for coloring darker and covering 100% white hair, 20 vol (6%) for lifting 1-2 levels, 30 vol (9%) for 2-3 levels and 40 vol (12%) for 3-4 levels with its Ultra Blonde 10- series. With its 1:1 mix, Wella’s Koleston Perfect usage guide gives its own figures: 2 levels of lift with 30 vol and 3 levels with 40 vol.

The 4 developer volumes, with the lift Igora Royal’s US guide assigns to each:

Volume	H₂O₂ %	Levels of Lift	Primary Use
10 vol	3%	Coloring darker, no lift	Color deposit, toning, soft gray blending (<30%); in Igora Royal, also covering 100% white hair
20 vol	6%	1-2 levels	Gray coverage, moderate changes
30 vol	9%	2-3 levels	Highlights, balayage, resistant dark bases
40 vol	12%	3-4 levels (10- series)	Quick bleaching, very resistant hair (high damage risk)

The professional rule: always use the minimum volume that achieves the goal.

Before you color or lighten:

Allergy test: Wella’s Koleston Perfect usage guide says to always perform an allergy test 48 hours before any color service. If you work with another line, do it as far ahead as its own sheet asks and, if it gives no window, at least not on the day of the color appointment. How to fit it into your book: 48-hour allergy patch test.

Lightening on the scalp: Wella’s global Blondor fact sheet says to use 6% (20 vol) or below when Multi Blonde powder goes on the scalp. Check your own lightener’s sheet.

Strand test: before applying to the whole head, and especially if the hair has been chemically treated or you don’t know its history, a strand test shows how it responds to the mix and the volume you chose. If it’s sensitized, cross-check with an elasticity test. Step by step: strand test.

When should you use each developer volume?

Volume choice depends on the service goal: 10 vol for depositing color or toning without any lift; 20 vol for gray coverage and 1-2 level changes; 30 vol for highlights and balayage; 40 vol for the highest lifts (high-lift tints or bleaching) on very resistant hair, with additional structural protection.

10 Volume (3%)

Ideal for:

Depositing color without lifting
Toning pre-lightened hair
Soft gray blending (less than 30%): it blends grays into the rest, it doesn’t cover them. To cover, follow your line’s sheet: Igora Royal’s US guide lists both 10 vol and 20 vol for gray coverage
Refreshing mids and ends

Don’t use when: You need lift or to cover resistant grays.

20 Volume (6%)

Ideal for:

Gray coverage
1-2 level changes
Color over color

30 Volume (9%)

For specific techniques:

Traditional highlights
Balayage with moderate lift
Dark bases that need more lift
Very resistant virgin hair

Caution: Can damage fine or sensitized hair.

40 Volume (12%)

Advanced professional use:

Quick bleaching
Very resistant hair
Specific techniques (with protection)

Warning: High damage risk. Avoid on treated or sensitive hair.

What factors determine the right developer volume?

Four variables determine the correct volume: hair condition (virgin vs treated vs damaged), porosity (high porosity requires lower volume), gray percentage (over 70% gray calls for 20 vol with pre-pigmentation and more time, not more volume) and desired lift level (no lift, 10 vol; to lift, whatever your line’s sheet assigns, such as 20 vol for 1-2 levels and 30 vol for 2-3 on Igora Royal’s US chart).

1. Hair Condition

Virgin: You can use higher volumes
Previously treated: Reduce the volume
Damaged: Maximum 20 vol with treatment

2. Porosity

High porosity: Absorbs quickly, use lower volume
Low porosity: May need higher volume or heat

3. Gray Percentage

< 30%: 20 vol to cover; 10 vol to blend them, or to cover them if your line allows it (Igora Royal’s US guide gives it for covering 100% white hair)
30-70%: 20 vol
> 70%: 20 vol with pre-pigmentation and full processing time. More volume lifts more and deposits less, which is the opposite of what a gray hair needs. Some gray-coverage lines do call for 30 vol: the US chart recommends it for Igora Royal Absolutes, then drops to 6% (20 vol) on more than 90% white hair. There, the sheet rules. Otherwise, reaching for 30 vol usually means you’re also lifting the base, which is a lift goal, not a coverage one

4. Desired Lift Level

No lift: 10 vol
1-2 levels: 20 vol on Igora Royal’s US chart; Wella’s Koleston Perfect usage guide already calls for 30 vol at 2 levels
2-3 levels: 30 vol
3+ levels: 40 vol where the sheet calls for it (high-lift tints, for instance), or pre-lightening

To count how many levels a service actually needs, compare the starting base and the target shade on the hair color level chart.

What are the correct color-to-developer ratios?

The ratio is set by the product line, not by the technique you’re about to do. The most widespread is 1:1, but plenty of lines use another: L’Oréal mixes classic Majirel at 1:1.5 and Majirel High Lift at 1:2, Wella runs Koleston Perfect at 1:1 except its Special Blondes (1:2), and Schwarzkopf runs Igora Royal at 1:1 except its 12- series (1:2). High-lift tints don’t share a single rule either: Igora’s 12- series calls for 1:2, but the 10- series and the Fashion Lights line from that same house mix at 1:1. Check the sheet for your specific line and use the developer mix calculator to nail the grams.

Here is what three houses publish for their permanent color lines:

Product line	Ratio	Sheet detail
L’Oréal Majirel, classic range	1:1.5	Shares its row with Cool Inforced and Majirouge in L’Oréal’s US chart
L’Oréal Majirel High Lift	1:2	Maximum-lift line
Wella Koleston Perfect	1:1	Usage guide example: 60 g color + 60 g developer
Wella Koleston Perfect Special Blonde	1:2	Usage guide example: 60 g color + 120 g developer
Igora Royal, including the 10- series and Fashion Lights	1:1	Colour cream : Oil Developer
Igora Royal 12- series, Special Blonde	1:2	The exception within that house
Powder lightener (Blondor Multi Blonde Powder)	1:1.5 to 1:2	Wella’s US lightening guide; another lightener, its own sheet

Look at those two Igora rows: two high-lift lines from the same brand, one at 1:1 and one at 1:2. That’s why “high-lift tints go at 1:2” doesn’t work as a rule.

This table is the tint:developer ratio of the color formula itself. Don’t confuse it with the gram amount of Special Mix concentrate you add inside that same formula to intensify a reflect: that one scales with the level of the Koleston shade it’s added to, a different mechanism. See it, exception at level 12 included, in how much Special Mix to add by level.

When to use 1:1, 1:1.5, or 1:2

The ratio directly affects the mixture’s consistency, processing time, and color saturation:

1:1: less developer per gram of cream and a denser mixture. It’s the ratio of most permanent color lines, gray coverage included.
1:1.5: the intermediate ratio. It’s what classic Majirel runs on (its High Lift goes 1:2), gray coverage included, so it isn’t a “softer” version of 1:1: it’s simply what that house asks for.
1:2: twice the developer per gram of cream compared with 1:1. It’s the ratio the Igora Royal chart and the Koleston Perfect usage guide set for their maximum-lift lines (the 12- series and Special Blonde), and the lift they list for those lines goes with that mix. Change it and you’re no longer following what the chart describes. It isn’t chosen for fluidity.

Pro tip: If you always use the same ratio regardless of the line in your hand, you’re working “by feel” on a part of the process where precision makes a real difference. A 0.1g precision scale costs less than $15 and immediately improves result consistency.

What happens when you use the wrong volume in real salon scenarios?

The consequence of the wrong developer volume depends heavily on the situation: with resistant grays it means insufficient coverage; with fine bleached hair it means breakage. Three salon scenarios: in the first two, the volume is wrong; in the third, porosity is in charge.

Scenario 1: Client with 80% gray and 10 vol

Imagine a client with 80% gray distributed all over the head. You use 10 vol because it’s “gentler,” on a line that doesn’t include it for gray coverage. The result: the gray doesn’t cover. You’ve worked outside what that line’s sheet gives for coverage.

The solution: For resistant gray at high percentages, use the volume your line gives for coverage (if it doesn’t allow 10 vol, go to 20 vol). If the gray is glassy (shiny, very resistant), consider 20 vol with the longest processing time its sheet allows, or a line built for gray coverage, following its own sheet (see Gray Percentage above).

Scenario 2: Balayage on fine hair with 30 vol

You have a client with fine, delicate hair who wants balayage. You use 30 vol because “it’s for highlights.” After 30 minutes, the highlighted sections are breaking and the hair feels like cotton.

The solution: On fine, sensitized, or previously treated hair, drop to 20 vol even when doing balayage. Developer volume is a parameter you should always adjust to hair condition, not just to the technique.

Scenario 3: Going back to brown over pre-lightened hair

A client wants to go back to brunette after being blonde. You use dark dye with 20 vol. The result: the color goes in much darker and more intensely than expected, because bleached hair has high porosity and absorbs pigment like a sponge.

The solution: Volume alone won’t fix this one: porosity is in charge. To deposit color on pre-lightened hair, use the volume your line’s guide gives for going darker, which changes from line to line: Schwarzkopf’s US Igora Royal guide gives 3% (10 vol) for coloring darker, and Wella’s Koleston Perfect usage guide gives 6% (20 vol) for same depth or darker. On hair this porous, a strand test tells you beforehand how dark it will go.

Situation	Common mistake	Correct volume
Resistant grays (>60%)	Using 10 vol where it isn’t approved for coverage	The coverage volume of that line, full processing time
Fine hair + highlights	Using 30 vol	20 vol
Toning pre-lightened hair	Using 20 vol	Whatever the toner’s sheet sets: a low volume or the toner’s own emulsion
Gray coverage + lift 1 level	Using 10 vol	20 vol
Bleaching damaged ends	Using 30-40 vol	Stop and treat first

What are the most common developer volume mistakes?

The four most frequent mistakes: always using 30 vol “just in case” (unnecessary damage), mixing developers from different brands (each chart gives its table with its own developer), not adjusting for individual hair condition, and ignoring porosity which directly affects the final result.

Always using 30 vol “just in case”: Causes unnecessary damage
Mixing developers from different brands: Can alter results. If you need to switch brands, use our hair color converter to check shade compatibility first
Not adjusting for hair condition: Every client is different - learn to diagnose in our color level guide
Ignoring porosity: Directly affects the outcome

For more common formulation mistakes, check our guide on color formulation errors.

How Blendsor Helps

Blendsor’s AI analyzes your client’s photos and recommends:

Optimal developer volume
Color to developer ratio
Processing time
Specific precautions

All based on hair condition analysis and the desired result.

Frequently Asked Questions

What developer volume should I use for gray coverage?

Each line answers differently. Igora Royal’s US developer guide lists 20 volume (6%) for coverage on white hair and also 10 volume (3%) for covering 100% white hair, so go by your own line’s sheet. For very stubborn grays above 70% coverage, combine 20 volume with a pre-pigmentation technique.

Can I mix different developer volumes together?

Yes, mixing developers from the same brand is a valid technique for achieving intermediate volumes. For example, mixing equal parts of 20 and 30 volume yields approximately 25 volume. Across different brands, no: each chart gives its lift table with its own developer.

What happens if I use a higher developer volume than needed?

Using more volume than necessary causes unnecessary damage to the hair fiber, excessive lift of natural pigment, and can alter the desired reflect. The professional rule is to always use the minimum volume that achieves the goal.

Does developer expire or lose potency?

Yes, developer loses potency over time, especially when exposed to heat or direct light. A developer with a loose cap loses hydrogen peroxide concentration, reducing its lifting power and potentially causing inconsistent results.

Recommended Professional Developers

These are the developers from the three houses this article cites. Each chart gives its tables with its own developer, so the most predictable choice is your line’s own:

Wella Welloxon Perfect: the developer Koleston Perfect’s usage guide names in its volume table.
L’Oréal Majicrème Developer: the developer L’Oréal’s US Majirel guide names, at 20 or 30 vol. Note: iNOA doesn’t use it; L’Oréal US mixes iNOA with the dedicated iNOA Oil Developer.
Schwarzkopf Igora Royal Developer: an Igora Royal developer. The table above is Schwarzkopf’s US usage guide for the IGORA ROYAL Oil Developer.

Tip: Use the developer from the same house as your dye: each chart gives its lift table with its own developer. When you switch brands, run a strand test first.

Try our developer-dye mix calculator to get the exact ratio for your case. And if you want to predict what happens when combining two shades, use our hair color mixing calculator.

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Mastering developers is what separates a good colorist from an excellent one.

Related articles:

Hair Color Developer: Choosing Volumes

What is developer and how does it work in hair coloring?

What volume of developer lifts how many levels?