Colour 6.37 by Yellow
PERMANENT COLOR. 70 different shades. Contains natural ingredients to care for the cosmetic effect in the hair. Yellow colours respect the hair fiber using only a small alkaline agent content in the colour. Contains argan oil and aloetrix with smoothing and protective properties. Low alkaline agent allows for color to lighten and color gently, ensuring maximum protection for the hair’s natural balance. Color results are vibrant and true to tone and can gently lighten up to 5 levels of lift. Perfect grey coverage, exceptionally long-lasting colour results. Creates a natural, bright and even color result with exceptional durability. NOT TESTED ON ANIMALS
Key Features
- Vibrant and true-to-tone color results
- Gently lifts up to 5 levels of hair lightness
- Contains argan oil and aloetrix for smoothing and protection
- Low alkaline agent for gentle treatment of hair fiber
- Provides excellent grey coverage
- Long-lasting color with natural, even finish
| Feature | Detail |
|---|---|
| Shade Range | 70 different shades |
| Lightening Level | Up to 5 levels of lift |
| Key Ingredients | Argan oil, aloetrix |
| Animal Testing | Not tested on animals |
FAQ
Can this color be used on grey hair?
Yes, Colour 6.37 provides perfect grey coverage and is ideal for covering grey hair with a natural, bright finish.
Does this product lighten the hair?
Yes, it can gently lighten hair up to 5 levels of lift while preserving the hair’s natural balance.
Is the formula safe for all hair types?
The low alkaline agent and natural ingredients make it suitable for most hair types, especially those seeking gentle color treatment.


Rose Henderson –
I’ve used this shade on my grey hair and it covers perfectly. The color is bright and even, and my hair feels smoother after application. No dryness or damage, which is a big plus.
Irene Stewart –
The result is very natural and vibrant. I noticed a slight lift, but it’s subtle and doesn’t make my hair look harsh. The argan oil really helps with softness.
Pippa Bell –
Great coverage for grey hair. The color stays true to tone and doesn’t fade quickly. A bit more coverage than I expected, so I might need a touch-up after a few weeks.
Connor Morrison –
I’m a frequent color user and this product stands out for its gentle formula. My hair feels healthier after each use, and the color lasts longer than other brands I’ve tried.
Anthony Wilkins –
The shade is exactly what I wanted — bright yellow with a natural look. It doesn’t over-lighten, and the protective ingredients help maintain hair health.