how shampoo for coloured hair work

Are shampoos for coloured hair really different from regular shampoos? Or is that an “excuse” brands use to sell you another shampoo you don’t need?

I’ve tried my fair share of shampoos for coloured hair back in high school, back when I was a blonde. I can’t say they did anything special for me. My hair still looked dull after a few weeks, no matter what magic words the shampoo bottle promised.

But times are a-changing. These days, some shampoos can help your new colour last longer. Here’s how shampoos for coloured hair work (and why some might not be worth the hype):

Coloured Shampoo (Misleading) Claims

Did you know most shampoos for coloured hair don’t claim to add color, just to enhance its appearance

The first thing to do when purchasing a shampoo for colored hair is to read the label carefully. You’ll see that most products claim to “enhance or revitalize richness and depth and add shine”, not to “add color to your hair”. What does this mean?!

Simply put, these products contain ingredients like silicones, polymers, and other conditioning agents. These coat your hair shaft, making it smoother and shinier. Think of them as the Instagram filter for your hair: they don’t change the colour itself but make it look better under the right conditions.

The science behind it? When your hair cuticle (the outermost layer) is damaged or rough, it scatters light, making your colour look dull or faded. By smoothing the cuticle, these shampoos help reflect light evenly, giving you that glossy, salon-fresh finish. And when hair is in good condition, it looks better – colour or not.

So, they do what they say on the tin. Just not in the way you might expect.

What About Shampoos For Coloured Hair That Contain Dyes?

Now we’re getting into the more “colour-savvy” shampoos. The ones that promise to extend or enhance your colour with added dyes. Here’s the deal:

Some shampoos for coloured hair contain dyes that are supposed to stick to your hair, helping to renew your colour so that it lasts longer. Obviously, the color of the dye matches that of the color the product is targeted to: yellow dyes are added to products for blondes and usually have a honeyed color, while brown dyes are included in shampoos for those that have brown hair and they are very dark in color.

But do these dyes actually work? Most of the time, they don’t. They’re largely for show. The colour in the product makes it look like it’s doing something fancy, but much of it rinses right off. Why? Because these dyes are added to rinse-off products, and the whole point of shampoo is, well, to rinse it out! By the time your hair is clean, most of that dye has gone down the drain.

Some shampoos can perform slightly better. Higher concentrations of dye or specific ingredients that help the colour adhere may leave a subtle tint. But don’t expect miracles. At best, they might enhance your tone or mask minor fading, but the results are typically so faint you’d need a magnifying glass to notice.

And here’s a heads-up: those vibrant pigments in the shampoo can stain your towels, bathroom tiles, and even your hands if you’re not careful. It’s like giving your shower a mini makeover you didn’t ask for.

P.S. If you’re willing to put in a bit of effort, Lakme Teknia has a range of shampoos enriched with dyes that actually work. I use them to cover my grey hair when I don’t have time for a proper dye job. The catch? Applying it evenly is tricky. Some silver strands stubbornly shine through no matter what.

Pay Attention To Harsh Cleansing Ingredients

Another trick to make your hair colour last longer is to pay attention to the cleansing ingredients in shampoos.

Truth is, even shampoos that are marketed for coloured hair can contain strong surfactants like Sodium Lauryl Sulfate, Ammonium Lauryl Sulfate, TEA-dodecylbenzenesulfonate and C14-16 olefin sulfonate that’ll strip your hair color off! Essentially, these ingredients treat your expensive colour job like it’s yesterday’s grease.

Instead opt for mild or extra mild shampoos with gentler cleansing ingredients like Sodium Laureth Sulfate and Cocamidopropyl Betaine. These are milder, less drying, and better at preserving your hair colour while still leaving your locks fresh and clean.

And if you really want to extend your colour’s life, think about how often you’re washing your hair. The more frequently you shampoo, the quicker the dye fades. Try stretching your washes to every other day (or even less if you can get away with it). Dry shampoos can be your best friend here, soaking up oil and keeping your hair looking fresh without the colour-stripping consequences of a wash.

Do You Really Need A Shampoo For Coloured Hair?

The truth is, shampoos for coloured hair aren’t that different from regular shampoos. They’re often marketed as “special” to justify a higher price, but in many cases, you’re just paying extra for a fancy label and a slightly tweaked formula.

If you’re really serious about keeping your colour fresh, your best bets are:

  • Gentle shampoos with no harsh surfactants.
  • Colour-safe conditioners and masks to add moisture and shine.
  • Occasional use of toning shampoos (like purple shampoo for blondes) if you notice unwanted brassy tones creeping in.
  • Minimizing heat styling and protecting your hair from UV exposure. (Yes, the sun can fade your colour, too!)

The Bottom Line

Save your money. Shampoos for coloured hair aren’t different from regular shampoos. Even when they have added dyes, they won’t stick well enough to your hair to make your hair colour last longer. Worse, shampooing too often or with the wrong shampoo can fade away the colour faster!