Best conditioner for colored hair: make the color last

Why does color fade even when you take care of it?

You color your hair on a Tuesday. By Saturday the mirror says something else: duller, a little cooler or a little more orange depending on where you started. You did nothing strange. You just washed your hair four times.

Every wash takes a little pigment with it. Hot water speeds it up, porous hair lets go sooner, and the shampoo you use matters too. So the question is not whether the color fades, because it always does: it is how long it takes, and how much of that is in your hands.

And before we talk about any bottle: the thing that moves the needle most costs nothing.

• Wait a couple of days before the first wash. The color needs that time to settle.
• Wash less often. It is the strongest lever and the least pleasant one to hear.
• Turn the water down, especially on the final rinse.

If you already do all three and your color still goes flat, then yes: it is time to look at the bottle you use after the shampoo. That is what the rest of this page is about.

Shampoo or conditioner? Which one protects the tone

Shampoo is a detergent. It carries a negative charge, it is built to pull grease off and leave down the drain. The ones for colored hair carry some conditioning agents inside, so they do not leave completely empty handed, but their job is still to clean.

A conditioner is built to stay, for four reasons:

• It carries a positive charge. Your hair is negatively charged to begin with, and bleach and color make that stronger.
• So it clings hardest exactly where the damage is, which is where color escapes first.
• It is acidic and lowers the pH, which helps close the cuticle.
• Part of it stays in the fiber after you rinse.

It is a difference of degree, not an on and off switch. But it is the half of the routine that comes closest to protecting your tone, and that is why its label is the one that deserves a slow read.

Work it from mid lengths to ends: that is the most battered part, and where the tone goes flat first.

What does a wash count on the label actually mean?

It means somebody ran a test. The useful question is: with what?

Of the brands that publish a color duration figure, the ones that explain how they got it all say the same thing: they measured it with the shampoo from the same line on. That is not a trick, it is the normal way to run a cosmetics test, and they write it in a footnote.

The problem is that the footnote does not travel with you to the shower. What reaches the shelf is the number, and there it reads like a promise made by that bottle alone.

And there is one more step, the one that surprises most. A third brand also says what test it ran, but its conditioner was not in it: it measured with the line’s shampoo and mask, over five applications, to hold up a promise of forty washes. The other two did include the bottle they sell.

So if the figure is what convinced you, buy its shampoo too. That is how you end up in the conditions where it was measured.

A bottle with no number is not a worse bottle

Publishing a figure is a commercial decision, not proof that something works. Some brands publish none and document other things well: the full ingredient list, the leave on time, which hair type it is for and which one it is not.

And some very visible numbers are measuring something else once you read them slowly. The most confusing one is shine, because two figures with the same shape answer different questions:

• A number of hours tells you how long your shine lasts between one wash and the next.
• A number of washes tells you how many times you can wash before the tone goes flat.

The label never warns you which of the two you are reading.

If what you want is to stretch the shine of your salon color between appointments, in Best Hair Gloss for Color-Treated Hair, Without the Tint we compared seven at-home glosses that do not promise to change your tone.

Caring for color and correcting tone are not the same job

There are two different products here sharing a name on the bottle, and plenty of people buy one expecting what the other does.

• A care conditioner tries to make the pigment you already have leave more slowly. It adds no color. Those are the ones we have covered so far.
• A toning conditioner carries pigment inside and deposits it every time you use it. It does not slow the fade: it disguises it, correcting the tone that shows through as color leaves.

Which one you need depends on what color is showing through, and that comes from where you started:

• If you are blonde or highlighted and it turns yellow you want violet pigment.
• If you are brunette and it turns orange or reddish you want blue pigment.

That is the color wheel: each pigment cancels the one across from it. We go into it in detail in purple shampoo for blonde hair and in blue shampoo for brunette hair.

Before you go looking, it helps to know where they live. Both toning conditioners on this list are professional channel, so you buy them where your colorist buys. And this list covers conditioners only: there are violet and blue masks and shampoos doing a similar job in a different step of your routine, and they are not here. L’Oréal’s drugstore violet is one of them: its own page calls it a mask.

Two warnings before you buy one. First, a toner does not replace your everyday conditioner: most are meant for once a week, not for every wash. Second, they overshoot if you push them: very porous or very light hair can grab the pigment and turn grey or lilac. Start with the shortest leave on time its page gives.

Do silicones ruin your color?

They do not ruin it. And there is a nuance almost nobody mentions: they are not all the same.

• Ordinary silicones sit on top of the hair and add shine from the outside.
• The ones carrying amino groups pick up a positive charge inside an acidic conditioner and stick mostly to the damaged spots, which are the most negatively charged. That is why you feel them most exactly where the hair is worst.

That second part has been described in cosmetics literature since the eighties, and a recent review repeats it in these words: amino-functional silicones bind selectively to the more damaged areas of the hair.

That ingredient has a name: amodimethicone. Redken lists it, and so does one of the two versions of the L’Oréal we picked up top, because that bottle is sold under two names and two formulas: Elvive Color Vive lists amodimethicone and counts its promise in washes; Elvive Color Vibrancy does not list it and counts it in days. Both publish the full list, so you can check which one you are holding. Others here do not publish theirs, and there is nothing to look at.

What is far less settled is the next jump: that this film makes your color last longer. Fading can be measured, and it is. There is published work in the journal of the cosmetic chemists society that puts colored hair through repeated washes and measures the color with instruments. Out of it comes something that fits everything above: what holds pigment best are positively charged ingredients.

But that work is about specific polymers, not about silicones. Crossing amino-functional silicone with color retention in the public medical literature database returned nothing. What does exist are conference abstracts signed by the silicone makers themselves, which is a different thing.

And the uncomfortable detail: not one of the ten brands backs its figure with work like that. The ones that explain their method are describing their own in house tests, with their own shampoo on.

What that means in practice:

• If what you want is slip and easy detangling, charged silicone does its job and you feel it from the first wash.
• If you would rather avoid them entirely, Living Proof Restore states it carries none and uses polyricinoleic acid to give a similar glide.

Why we recommend the cheap one, said plainly

You should know this, because the rest of the article seems to say the opposite.

Up top we picked the L’Oréal. And its figure comes with a catch worth knowing: the test behind it was run with the line’s shampoo and mask, not with this conditioner. By our own yardstick, the best documented figure on this page is not its own.

We recommend it anyway, and not because of its number. We recommend it because for the job being asked of it here, which is upkeep at home between appointments, it does the work and you have it to hand.

And it is worth saying what that is not. A bottle you use at home does not do your colorist’s job, and it does not replace a service. Professional channel products are built to support that work, with formulas and timings chosen for your specific hair: a different thing, not an expensive version of the same one. If what you want is the best documented figure, that one belongs to Kérastase, and it is up top in its own case.

A good conditioner does not show on day one. It shows three weeks later, in how the hair feels and how easily it detangles.

What you will find here, and what you will not

We go to each brand’s official page and look for the same things every time:

• What it promises about color, and with what figure.
• Whether it explains how it measured it, and whether that figure is for the bottle alone or for the whole routine.
• Which ingredients it declares, and whether it publishes the full list.
• How long it asks you to leave it on, and which hair it says no to.

We have not tested any of them, so you will not find an effectiveness ranking here. You will find the ten labels laid on the same table, which is when the thing no brand writes on its own bottle shows up. The literal quotes, with their link and the day we read them, are at the end of this page.