Why Natural Roots Go Brassy With Permanent Color
By the Formula Finder teamUpdated 7 min read
The short answer
Permanent color with 20 or 30 volume lifts natural regrowth and exposes warm underlying pigment, so a shade at or above the natural level lands orange or gold. With no gray to cover, use a demi-permanent at the natural level, and save permanent for gray coverage or real lift.
On this page
Natural regrowth goes brassy when a permanent formula lifts the natural pigment faster than its dye can control the warmth it exposes. The shade isn't the problem. The lift is. Take the lift out of the root formula and the brass goes with it.
What happens on a natural root
Every natural level sits on warm underlying pigment. Kenra defines underlying pigment as the undertone exposed any time natural hair color is lifted, and the Matrix haircolor manual describes the same thing: as hair lightens, red, orange and yellow come forward.
Permanent color is oxidative. The alkalizer and developer open the cuticle, break down some natural melanin and form new dye in the cortex, all in one step. Matrix's rule is up to one level of lift for every 10 volume of developer: 10 volume up to 1 level, 20 up to 2, 30 up to 3 and 40 up to 4.
Run the classic case. A client is a natural level 6, and the root gets a level 7 permanent with 30 volume. That developer can lift the natural base past 7 toward 8, straight through orange-gold into gold. A level 7 natural shade carries only enough tone to look like a 7 on a 7. It doesn't carry extra blue or violet to cancel exposed orange. The root lands lighter and warmer than the target and reads brassy next to the mids and ends.
Three things make roots worse than lengths:
- Virgin hair lifts, colored hair mostly doesn't. Tint doesn't lift tint. Previously colored mids and ends hold the dye already in them, so only the regrowth changes level.
- Scalp heat speeds processing. The first inch off the scalp develops faster than the rest of the strand. That bright band at the part is the classic hot root.
- Light shades carry less dye. The lighter the target, the less pigment there is to sit over the warmth you just exposed.
Underlying pigment by level
This is the map of what shows up when a natural base is lifted. Brands draw the lines a little differently, often about one level apart, so read the warmth band, not one exact word.
| Natural level | Name | Underlying pigment exposed | Tone that neutralizes it |
|---|---|---|---|
| 1 | Black | Dark red-brown | Green |
| 2 | Darkest brown | Red-brown | Green |
| 3 | Dark brown | Red | Green |
| 4 | Medium brown | Red-orange | Blue-green |
| 5 | Light brown | Orange | Blue |
| 6 | Dark blonde | Orange to gold-orange | Blue |
| 7 | Medium blonde | Gold-orange to gold | Blue-violet |
| 8 | Light blonde | Gold to yellow-gold | Violet-blue |
| 9 | Very light blonde | Yellow | Violet |
| 10 | Lightest blonde | Pale yellow | Pale violet |
Lift a natural 6 one level and you're into gold-orange. Lift it two and you're into gold. That's the brass the client is pointing at in the mirror.
The fix when there's no gray: demi at the natural level
When the client has little or no gray and wants to stay at their natural depth, put a demi-permanent at the natural level on the root. Demi is deposit only, or very close to it, and runs on low-volume developer, so it doesn't open up the natural pigment and expose warmth. The root matches the lengths without being lifted.
Two choices make it work:
- Formulate at the natural level, not above it. A natural 6 gets a level 6 demi. If the client wants brightness, put it in the tone, not the depth.
- Pick a tone that matches the lengths. Neutral or natural ash keeps the root from leaning warm. Gold and copper demis read warm on purpose.
Demi lines that fit the job
Redken Shades EQ is an acidic, ammonia-free, no-lift gloss. Every shade mixes 1:1 with Shades EQ Processing Solution and processes 20 minutes at room temperature on dry hair, up to 40 minutes on gray. It blends gray but isn't a full coverage color. For a natural 6, 06N Moroccan Sand matches depth, and 06NA Granite gives a cooler finish.
Matrix Super Sync is a pre-bonded alkaline demi. It mixes 1:1 with Matrix Cream Developer 10 volume only and processes 20 minutes at room temperature. It gives up to one level of lift, which is one more reason to keep it at the natural level when brass is the worry. NN shades cover up to 75% gray, and the rest of the palette up to 50%. Matrix calls for clean hair that is about 80% dry, since damp hair gives a lighter, more diluted result. For a natural 6: 6N, 6NN or 6NNA for a touch of ash.
Wella Color Touch is ammonia-free and mixes 1:2 with Color Touch Emulsion, for example 30 g color to 60 g emulsion. It processes 20 minutes, or 15 with heat. The 1.9% (6 vol) emulsion is the one for same-depth deposit and toning. The 4% (13 vol) adds vibrancy and brightening, which is the opposite of what a brassy root needs. Color Touch blends up to 50% gray. For a natural 6, 6/0 Dark Blonde or 6/71 Dark Blonde/Brown Ash.
Each brand writes level and tone its own way. If a code like 06NA or 6/71 doesn't read clearly yet, how to read a hair color chart breaks the numbers and letters down.
When to use demi vs permanent on roots
| Situation at the root | Use | Why |
|---|---|---|
| No gray, staying at natural level | Demi at the natural level | Deposit only, so no exposed warmth |
| Light gray, client happy with a soft blend | Demi at the natural level | Gray blends in instead of disappearing |
| Going darker than natural | Demi at the target level | Darker only needs deposit |
| Heavy or resistant gray, full coverage wanted | Permanent at the natural level, 20 volume | Opaque coverage needs oxidative color |
| Roots lighter than natural | Permanent with lift and a cool or neutral tone | Only permanent lifts, so tone has to control the warmth |
| Warm, bright regrowth wanted on purpose | Permanent gold or copper with lift | The exposed warmth becomes part of the result |
When permanent is the right call
Gray coverage. Demi blends gray. Permanent covers it. For heavy or resistant gray, use a permanent at the natural level with 20 volume and a natural or extra coverage shade. Matrix SoColor Extra Coverage, such as 506N, mixes 1 oz color to 1 oz 20 volume and processes 30 to 45 minutes, using the full 45 on resistant gray. Wella Koleston Perfect reaches up to 100% gray coverage with a Pure Natural shade like 6/0 in the formula and 6% (20 vol). At the natural level with 20 volume, the natural base barely moves and the gray takes the deposit.
Lift as the goal. When the client wants roots a level or two lighter than natural, permanent is the only option. Plan for the warmth you're about to expose instead of chasing it afterward. Lifting a natural 6 to a 7 opens gold-orange, so the formula needs cool or neutral tone to cancel it, for example a natural ash such as SoColor 7NA rather than a straight natural. That's the basic color wheel rule Matrix teaches: cool tones neutralize warm tones. Match the developer to the lift you actually want. One level of lift doesn't need 30 volume, and every extra 10 volume is another level of warmth you'll have to cover.
Fixing roots that already went brassy
A brassy root is lighter and warmer than the lengths. The correction is deposit, not more lift. Use a demi on the regrowth band only, with a tone from the cool side of the wheel.
- Client likes the new depth: tone at that depth with an ash. A root that lifted to a gold-orange 7 takes something like Shades EQ
07NAPewter or Color Touch7/1Medium Blonde/Ash. - Client wants it back to natural: use a demi at the natural level with a neutral or ash tone, like the level 6 shades above. The deeper deposit covers the warmth and brings the depth back down.
At the next retouch, change the root formula so it doesn't happen again: demi at the natural level when there's no gray, or permanent at the natural level with 20 volume and a neutral or ash tone when coverage is needed. Formula Finder builds formulas from real shade codes in your brand, starting from the client's inspo pic.
FAQ
Why are roots orange after a permanent color?
The virgin regrowth lifted under the developer and exposed orange underlying pigment that the shade's tone couldn't cancel. It shows up most when the shade is lighter than the natural level or the developer is 30 volume or higher.
Does demi-permanent color cover gray roots?
Demi blends gray more than it covers it, and the limit depends on the line. Matrix Super Sync NN shades cover up to 75% gray, while Redken Shades EQ blends gray without full coverage. Heavy or resistant gray needs a permanent at the natural level with 20 volume.
What developer keeps virgin roots from turning brassy?
When no lift is needed, skip permanent and use a demi with its own low-volume developer or processing solution. For a permanent at the natural level, 20 volume gives coverage with little lift, while 30 volume can lift up to three levels and expose much more warmth.
What color cancels brassy roots?
Blue cancels orange, blue-violet cancels gold-orange and violet cancels yellow. Choose an ash or natural ash demi at the level the root is sitting at, or at the natural level if the client wants the depth back.