Say your hair got relaxed a few weeks ago, and now you're standing in front of a box of permanent color, developer bottle in hand, reading directions that were clearly written for hair that has never seen a chemical service in its life. Every generic developer chart online will tell you what 10, 20, 30, and 40 volume do in general. None of them tell you what changes once your hair already has a chemical history. That's the actual gap, and it's the one this guide fills.
What the generic developer chart gets right
The generic 10 to 40 developer-volume chart isn't wrong, and this article isn't here to throw it out. Ten volume developer deposits color with little to no lift, which makes it the pick for toning down or depositing color rather than lightening anything per uglyducklingcolor.com's developer strength breakdown.
Twenty volume is the workhorse: about a one to two level lift, and the standard choice for gray coverage, according to the same source.
Thirty and forty volume step up from there, giving roughly a two to three level lift up through maximum lift, and they're the strengths typically paired with bleach for bigger changes.
| Volume | What it does | Typical use |
|---|---|---|
| 10 | Deposits color, little to no lift | Toning down, deposit-only color |
| 20 | About a 1-2 level lift | Standard gray coverage |
| 30-40 | About a 2-3 level lift, up to maximum lift | Bigger color changes, used with bleach |
If your hair has never been chemically processed, that chart is basically the whole answer. Keep reading if it hasn't been.
Why relaxed hair breaks the chart's assumption
Relaxed hair isn't just "more porous" than virgin hair, and treating it that way undersells what's actually going on. A peer-reviewed proteomic study found that alkaline relaxing treatment produces its own distinct protein modifications in the hair fiber, concentrated at the same cysteine sites that peroxide processing also targets. In plain terms: your relaxer already changed your hair's chemistry at specific points, and a peroxide-based color service adds more damage at those exact points rather than starting on a clean, merely-more-open cuticle.
That study is lab-grade evidence about how relaxing and bleaching damage hair fiber, not a test of relaxed hair getting colored afterward, and it doesn't hand you a specific safe volume number. What it does support is the reason relaxed hair deserves a different starting assumption than virgin hair, which is exactly the piece the generic chart above leaves out.
The real-world fix: treat the chart's number as a ceiling, not a target
People with relaxed hair who've actually combined a relaxer and permanent color talk about the results very differently from the generic guides, and they don't fully agree with each other either. In one active relaxed-hair discussion thread, several commenters say flatly not to combine a relaxer and permanent color at all, full stop, citing their own breakage after trying it. Others in that same thread report going one step down from what the generic chart would suggest, using 10 volume instead of 20 for a black-to-brown lift on already-processed hair, and getting the result they wanted without the damage. Neither camp is wrong; they're describing different risk tolerances on the same real trade-off, and a strand test matters regardless of which one you trust more.
If your actual goal is routine, like covering gray or a subtle darkening rather than a dramatic change, start conservative and strand test first. We don't stock a 10 volume developer, so if you specifically want to replicate the more cautious approach some relaxed-hair users describe, that's worth a professional's chair rather than a DIY box. Our own shelf starts at 20 volume, in Clairol Professional 20 Volume Developer and Superstar 20 Volume Cream Peroxide Developer, and either is the right starting point for that routine goal once you've strand tested.
If your goal is bigger, something closer to that black-to-brown example, the step-down instinct still applies on top of whatever volume would normally get you there, and a strand test is non-negotiable no matter how porous you assume your hair already is. Superstar 30, 40, and 50 volume developer cover that higher end of the ladder, but for actual lightening on relaxed hair, a colorist quoted by Teen Vogue puts it plainly: "relaxed hair doesn't always react how you think it will to bleach and color," and a professional will know what percentage peroxide to use and how long to leave it on in a way a box instruction sheet can't account for.
| Reader goal | Recommended starting point | Store options | Caveat |
|---|---|---|---|
| Routine (gray coverage, subtle darkening) | 20 volume, strand test first | Clairol Professional 20 Volume, Superstar 20 Volume | We don't carry 10 volume; a professional can replicate that more conservative approach if you specifically want it |
| Bigger change (e.g., black to brown) | Step down from whatever volume normally reaches that lift | Superstar 30, 40, or 50 Volume | Strand test regardless of assumed porosity; see a professional for actual lightening |
The myth that causes over-processing
"My hair already feels damaged, so it must need less time" is one of the most common assumptions relaxed-hair readers make, and it's backwards. A commenter with real coloring experience correcting exactly this assumption on Reddit points out that fragile or porous hair, including gray and resistant strands, may still need close to the full processing time for an even result. The fix isn't a shorter timer guessed from how your hair feels; it's a strand test.
Getting this wrong costs you either way. Cut the time short on the assumption that damaged hair processes faster, and you can end up with patchy, uneven color that didn't develop evenly. Overcorrect the other direction out of caution, and you risk over-processing hair that was already compromised before you started. A strand test is the only way to know which side of that line you're actually on.
Timing and the lower-risk routine option
Real-user consensus among relaxed-hair wearers puts the minimum wait between a relaxer and a permanent color service at two to four weeks, ideally with a bond-strengthening treatment worked in between the two per the same relaxed-hair discussion thread. Skipping that gap is exactly what shows up in the breakage stories from the commenters who say never to combine the two services at all.
The users in that thread reporting the least damage overall share one other habit: they treat semi or demi-permanent color as their routine choice, gray coverage, a refresh, whatever doesn't need to be dramatic, and save full permanent color for the rare times they actually want a real change. If that's the path that fits what you're after, keeping the color from fading fast between touch-ups is its own separate routine; our guide to maintaining vibrant semi-permanent color walks through that part.
If your goal is routine, gray coverage or a subtle refresh on relaxed hair, semi or demi-permanent is your lowest-risk lane, or 20 volume with a strand test if you need something permanent, spaced at least two to four weeks from your last relaxer.
If your goal is a real color change instead, the step-down instinct applies, the strand test is not optional, and actual lightening belongs in a professional's hands.
Once you've settled on the volume side of this decision, picking the actual shade is the next call, and our guide to choosing a warm copper direction is a good place to keep going. For the routine path, Clairol Professional 20 Volume Developer is where we'd point you first.
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