A reliable and gentle system:
a natural touch for healthy locks and intense, long-lasting tones.

Yo Color System is a complete wellness treatment, a soft yoghurt-based mixture with certified organic ingredients.

The harmony of nature at the service of your hair.

Tone-on-tone hair colour

in gel cream with an essentially neutral pH, in a 60 ml tube.

Makes it possible to restore level and tone in cosmetically treated hair, increasing the duration and level of shine of the results with a gentle and restorative action that does not further sensitise the structure.

For more intense results on natural hair, it is recommended to mix Yo Green with NaYo, providing the Intensive and Light Yo Demi services. Up to 84% natural origin ingredients: this is a value calculated in accordance with the ISO 16128 technical standard after mixing Yo Green colour cream with 6.5- volume Yo Green Activator.

Hair Dye 

Hair Dye

Hair Dye

Hair Dye

Hair Dye

Hair Dye

Golden Blonde Hair Color

Hazelnut Shell Color

Brown (Auburn) Color

Light Brown Color

Dark Brown Color 

Hair Color

Hair Color

Hair Color

Koleston 66/46 is a permanent hair dye shade from Wella’s Koleston line. The numbering system indicates the color composition:

• 66/ – Double intensity of the primary tone (which is a deep red in this case).

• /46 – The first number (4) represents a red tone, and the second number (6) represents a violet tone.

This means Koleston 66/46 is an intense red-violet shade.

If you're asking about how this color looks in sunlight, it will likely appear vibrant and reflective, with rich red tones that become more intense under direct light, and violet undertones that may become visible depending on your base hair color and the lighting conditions.

🌟 Koleston 66/46 (Intense Red Violet) – How It Looks & How to Maintain It 🌟

🔆 How It Looks in Sunlight

• In direct sunlight, the red tones will appear more intense and fiery, making the hair look super vibrant.

• The violet undertones may become more noticeable under different lighting conditions, especially in the shade or indoors.

• On lighter hair (blonde/light brown): The red-violet will show up vividly, especially in the sun.

• On darker hair (brown/black): The red tones may be more subtle, but will still reflect light beautifully.

💆‍♀️ How to Maintain the Color

🔥 Use Sulfate-Free Shampoo – Helps prevent color from fading too quickly.
🚿 Wash with Cool Water – Hot water strips color faster.
☀️ UV Protection – Sun exposure can fade reds fast, so use a UV-protectant spray or wear a hat.
🩷 Color-Depositing Conditioner – Red and violet pigments fade quickly, so use a red or violet color mask weekly.

Koleston 7/77 – Blonde Red

Koleston 7/77 (Blonde Red) is a vibrant, medium blonde shade with intense red undertones, offering a bold and fiery color result. This rich combination of blonde and red delivers a striking, multi-dimensional look, perfect for those seeking a dynamic and warm blonde with a passionate red hue.

Key Features:

✔ Medium blonde with intense red undertones for a dramatic, vibrant color
✔ 100% gray coverage for flawless, even results
✔ Moisturizing formula to nourish and protect your hair during the coloring process
✔ Fade-resistant technology for long-lasting, vibrant color
✔ Post-color treatment included to lock in moisture and enhance shine

Koleston 7/77 Blonde Red is perfect for those who want to add bold, fiery red hues to their blonde, creating a radiant, multi-dimensional finish that will turn heads.

Application & Maintenance Guide for Koleston 7/77 (Blonde Red)

Application Instructions:

1. Preparation:

   • Wear gloves to protect your hands.

   • Mix the Koleston 7/77 color cream with the provided developer in a 1:1 ratio.

   • Apply to dry, unwashed hair for optimal results.

2. Application:

   • For full-head application: Start by applying the color at the roots and evenly distribute it throughout the hair for a consistent result.

   • For root touch-up: Apply the color first to the roots, let it process for the recommended time, and then spread it to the rest of the hair.

3. Processing Time:

   • Leave on for 30-40 minutes (or follow the instructions on the box).

4. Rinsing & Aftercare:

   • Rinse thoroughly with lukewarm water until the water runs clear.

   • Apply the Koleston Post-Color Treatment (if included) to lock in moisture, enhance shine, and keep your hair feeling soft and nourished.

Koleston 6/7 – Dark Blonde

Koleston 6/7 (Dark Blonde) is a natural dark blonde shade that gives a rich, cool, and balanced color. This color is perfect for anyone who wants a neutral blonde that isn’t too warm or too cool, offering a classic and sophisticated appearance with deep, natural-looking blonde tones.

Key Features:

✔ Natural dark blonde shade that provides a subtle, sophisticated look
✔ 100% gray coverage for flawless, even color
✔ Moisturizing formula to nourish and protect hair during the coloring process
✔ Fade-resistant technology to ensure long-lasting color
✔ Post-color treatment included to lock in moisture and enhance shine

Koleston 6/7 Dark Blonde is ideal for those who want a rich, deep blonde with a neutral tone, perfect for a natural, classic blonde look.

Application & Maintenance Guide for Koleston 6/7 (Dark Blonde)

Application Instructions:

1. Preparation:

   • Wear gloves to protect your hands.

   • Mix the Koleston 6/7 color cream with the provided developer in a 1:1 ratio.

   • Apply to dry, unwashed hair for best results.

2. Application:

   • For full-head application: Start at the roots and apply evenly to the rest of the hair to ensure even coverage.

   • For root touch-up: Apply the color first to the roots and spread it to the rest of the hair after the recommended time.

3. Processing Time:

   • Leave on for 30-40 minutes (or follow the instructions provided on the box).

4. Rinsing & Aftercare:

   • Rinse thoroughly with lukewarm water until the water runs clear.

   • Apply the Koleston Post-Color Treatment (if included) to seal the color, add shine, and maintain softness.