Hair colouring is one of the most popular procedures in beauty salons. The desire to cover gray hair, deepen the colour, or radically change it compels people to book an appointment with a hairstylist and apply dye. Immediately after leaving the salon, the results are impressive – a rich shade, brightness, and shine. However, after a short time (sometimes just a couple of weeks), the colour seems to fade, becoming duller, and acquiring an undesirable tone. In most cases, the cause is not a poor-quality dye or an incompetent hairstylist, but daily care – shampoo. It can quickly wash out colour, thereby ruining a beautiful hairstyle and causing damage to the hair. How this works and how to fix the situation – we explain in this article.
It’s all about shampoo: why does colored hair need specialised products?
First, let’s look at what happens to hair after colouring. Pigment – natural or artificial – is contained in the cortex, the central part of the hair. For the dye components to penetrate and work (i.e., change the hair colour), the cuticle must be opened – this is accomplished by the alkaline ingredients in cosmetic products. The cuticles, raised by the alkali, are then sealed with special rinses containing acids. However, even after this, the cuticle doesn’t return to its original, sealed state; the cuticle remains raised, causing the colour to gradually wash out.
Now, let’s recall what’s in a regular shampoo. Sulfates are the main cleansing ingredients. They lather beautifully and remove impurities, but they also further raise the cuticles, washing out colour along with sebum. Warm shades (caramel, copper, gold) are particularly vulnerable, as their pigments are larger and therefore less effectively retained in the cortex. Instead, they leave behind ash, gray, and greenish tones you weren’t planning on. To avoid unwanted tones and preserve the health of your hair, a gentle shampoo formulated for colour-treated hair is essential. One example of such a product is Stardust Nourishing Shampoo from the British brand Lunesi. It’s sulfate-free, using mild surfactants instead, which gently cleanse impurities without stripping colour.
How does a specialised shampoo work?
Let’s examine its mechanism of action using the product mentioned above. It’s classified as a nourishing shampoo, which can be a concern for some. The main concern in this case is the potential for weighing hair down. To address this upfront – no, Stardust doesn’t weigh hair down, because its formula works quite differently. It’s designed to nourish strands along their entire length, not just the roots alone. What makes this shampoo and similar ones ideal for colour-treated hair:
- Mild surfactants. It doesn’t contain sulfates; instead, it uses surfactants that gently remove impurities without disrupting the natural lipid layer. As a result, the cuticle does not open, and moisture and pigment are retained.
- Lightweight nutrients. No silicones or heavy oils; instead, the formula contains light vegetable oils, proteins, amino acids, and plant extracts. These penetrate deeply, work from the inside without leaving a heavy residue or weighing the hair down.
- Proper pH. The hair and scalp have a slightly acidic environment – 4.5-5.5. Most regular shampoos have a neutral or slightly alkaline pH, which helps cleanse effectively but can also lift cuticles and accelerate colour fading. Professional cosmetics have a slightly acidic pH that actively supports hair health and preserves its colour.
Using a high-quality nourishing shampoo not only maintains your desired shade but also nourishes your locks from the inside, making them stronger, healthier, and more beautiful.
Benefits of shampoos with mild surfactants for colour-treated hair
One might assume the benefits are self-evident, but it’s worth spelling out exactly what you gain by switching to professional hair care products or with gentle formulas or hair extensions. The main advantages are as follows:
- Longer intervals between colourings. It’s logical: the longer the colour’s richness lasts, the less often you need to visit your stylist. This saves time and money and is less traumatic for your hair.
- Less mechanical damage. It’s all about the cuticles: when they’re closed, hair is less prone to tangling and frizz, easier to comb and style, and less susceptible to split ends.
- A healthy scalp. Harsh surfactants negatively impact more than just your hair. The scalp, striving for balance, produces even more sebum, which can lead to itching, dandruff, and redness. Sulfate-free shampoos leave all of that behind.
- Hair extensions add additional protection from external influences. Hair is always vulnerable to UV rays, dry air, hard water, and other factors. Light, nourishing formulas in high-quality shampoos strengthen the hair barrier, thereby protecting it.
To get the most out of a sulfate-free shampoo, it’s important to use it correctly. Apply a small amount to damp hair, gently massage your scalp with your fingertips, rinse with warm but not hot water, then finish with a cool-water rinse.
