What does 6.6R actually mean?
In the Rusk numbering system, the first digit (6) indicates the depth — level 6 is a dark blonde/light brown base. The second number (6) is the secondary tone, and R stands for Red. Together, Rusk Deepshine 6.6R gives you a shade that sits at a medium-dark depth with a double dose of red pigment, producing an intense, saturated red that isn't just a surface tone — it's built into every strand.
Key features
- Permanent coverage – Full grey coverage and lasting colour
- High shine – Deepshine complex adds mirror-like gloss
- Conditioning formula – Silk proteins protect hair during colour
- Vivid pigment – Double-red formula for true intensity
Who is 6.6R best suited for?
6.6R works beautifully on level 4–6 natural bases — dark brown to light brown hair. If your hair is already in this range, you can expect a vivid, warm red result with excellent colour deposit. On naturally darker bases (level 3 or below), the red will appear deeper and more burgundy-toned, which is equally gorgeous. On pre-lightened or lighter bases, the red will appear brighter and more vibrant.
Shade tip: Want a brighter, cherry red? Pre-lighten to level 7–8 before applying 6.6R. Prefer a deeper, wine-like red? Apply directly over your natural dark base without pre-lightening.
How to apply Rusk Deepshine 6.6R
- Perform a skin allergy test 48 hours before colouring. Mix a small amount of colour and developer and apply behind the ear or to the inner elbow.
- Mix 60ml of Rusk Deepshine 6.6R with 60ml of Rusk Deepshine developer (20 vol / 6% for standard coverage, 10 vol for toning or refreshing).
- Section clean, dry hair into four quadrants. Apply colour starting at the roots, working section by section from the nape upward.
- Process for 30–45 minutes at room temperature. Check colour development every 10 minutes.
- Rinse thoroughly with warm water until the water runs clear. Follow with a colour-safe conditioner to lock in shine.
Pro tip — keeping red hair vibrant: Red pigment molecules are among the smallest in hair colour, which means they fade faster than other shades. Use a sulphate-free, colour-protecting shampoo, rinse in cool water, and avoid excessive heat styling to extend the life of your red.
Shades that complement 6.6R
For a multi-dimensional finish, 6.6R layers beautifully with other Rusk Deepshine shades. Try blending with:
- 5.5R Dark Red Brown
- 7.4 Copper Blonde
- 6N Dark Natural Blonde
- 6.43 Hazelnut
- 7.6R Red Blonde
Frequently asked questions
Will 6.6R cover grey hair?
Yes — as a permanent colour, Rusk Deepshine 6.6R provides full grey coverage when mixed with 20 vol developer. For resistant greys, ensure even saturation and allow the full 45-minute processing time.
How long does the colour last?
With proper aftercare, you can expect 4–6 weeks of vibrant colour before noticeable fading. Using a colour-depositing conditioner in between can extend this significantly.
Can I use this on previously coloured hair?
Yes, but results may vary depending on the existing colour underneath. If your hair has warm or red tones already, the result will be more intense. If it has cool or ashy tones, the red may be slightly muted — consider applying over a neutral base first.
What developer should I use?
20 vol (6%) developer is recommended for standard coverage and lift. Use 10 vol (3%) for toning, refreshing, or on already-lightened hair. Avoid 30 vol or above — the extra lift can compromise red pigment deposit.
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