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Overtone Cosmic Cobalt color depositing treatment mask jar with blue paste on a white background
Overtone Cosmic Cobalt color depositing treatment mask jar with blue paste on a white background

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Cosmic Cobalt Color Depositing Treatment Mask

previously known as Extreme Blue Coloring Conditioner

4.5
Rated 4.5 out of 5 stars
335 Reviews
Size8oz
$32.00
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Product Details

Vegan, Leaping Bunny and PETA certified, Overtone Cosmic Cobalt Color Depositing Treatment Mask is a bold, electric blue treatment designed for those who want high-impact color, deep hydration, and luminous shine without damage. Ideal for blonde, pre-lightened, or lighter brown hair, it delivers a saturated cobalt blue hue that lasts about 2–3 weeks or up to 10 washes, then fades gradually and evenly.

This semi-permanent, deposit-only formula creates vivid, true blue color on lighter bases and a softer, cool-toned tint on darker hair. For the boldest, most vibrant cobalt results, you will need to bleach (pre-lighten) hair prior to applying. On blonde or pre-lightened hair, Cosmic Cobalt appears as a bright, electric blue with intense saturation and shine. On light to medium brown hair, it creates a deeper, more muted blue overlay. On darker hair, it enhances shine with a subtle blue reflect rather than a dramatic color transformation.

Color appears bold, vibrant, and multi-dimensional never flat and fades into softer blue tones over time for a lived-in, editorial finish.

The mask doubles as an intensive conditioner. Shea butter plus coconut, avocado, olive, linseed, sesame, jojoba, and evening primrose oils help deliver deep hydration, softness, and luminous shine while supporting stronger-feeling strands.

The gentle formula is non-damaging, ammonia-free, peroxide-free, vegan, and cruelty-free. Application is simple and convenient at home with salon-quality results. Always apply gloves to dry hair, saturating evenly from roots to ends. Leave on for 15 minutes, then rinse thoroughly with warm water. Use weekly to maintain vibrancy, tone, and shine.

Enjoy premium color and conditioning care in one mask low commitment, high impact, and effortless at-home results for anyone ready to explore bold, salon-inspired blue without the salon visit.

Individual color results may vary*
Ingredients

Ingredients: Water (Aqua/Eau), Cetearyl Alcohol, Cetyl Alcohol, Stearyl Alcohol, Behentrimonium Chloride, Glycerin, Guar Hydroxypropyltrimonium Chloride, Butyrospermum Parkii (Shea) Butter, Cocos Nucifera (Coconut) Oil, Simmondsia Chinensis (Jojoba) Seed Oil, Oenothera Biennis (Evening Primrose) Oil, Persea Gratissima (Avocado) Oil, Olea Europaea (Olive) Fruit Oil, Linum Usitatissimum (Linseed) Seed Oil, Sesamum Indicum (Sesame) Seed Oil, Mentha Cardiaca (Spearmint Oil), Rosmarinus Officinalis (Rosemary) Leaf Oil, Benzyl Alcohol, Dehydroacetic Acid, Polysorbate 60, Amodimethicone, Phenoxyethanol, Ethylhexylglycerin


Contains one or more of: Basic Blue 9, Basic Blue 99, Basic Orange 2, Basic Violet 1, Basic Violet 2, Acid Violet 43, Basic Red 46, Basic Red 76, Basic Green 4, Basic Brown 16, Basic Yellow 57, Basic Yellow 40
How to use

With gloves, apply the Color Depositing Treatment Mask evenly to dry hair. Allow it to infuse for 10-15 minutes, embracing the transformation. Then thoroughly rinse your hair and scalp with warm water. For continually vibrant hues, make this ritual a weekly affair!

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Cosmic Cobalt Color Depositing Treatment Mask

$32.00

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4.5
Rated 4.5 out of 5 stars
Based on 335 reviews
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335 reviews
  • DN
    Dan N.
    Verified Buyer
    Reviewing
    Cosmic Cobalt Healthy Color Duo
    I recommend this product
    Pre-Bleached? No
    Starting Shade Black
    Hair Texture Straight
    Product Standouts Vibrant Color, Easy To Use
    Age 55+
    Rated 5 out of 5 stars
    14 hours ago
    So many compliments

    I've been rocking the Cobalt Blue for a while and I get so many compliments on my hair color. I have quite a bit of white hair and while it doesn't cover the white completely, it turns it into the prettiest silver blue shade.

    Was this helpful?
    oVertone Color
    4 minutes ago

    Hi Dan! We absolutely love hearing this - you're getting compliments left and right because that Cosmic Cobalt is clearly working its magic on you! What you're describing sounds absolutely gorgeous - that silver blue transformation on white hair is honestly one of our favorite effects that Cobalt Blue creates. It's such a beautiful, sophisticated look that really makes people do a double-take in the best way possible. We're thrilled that you've been rocking this shade for a while and that it's giving you that stunning color payoff that has everyone asking about your hair. That silver blue tone you're getting is exactly the kind of beautiful result that makes us love what we do - you're absolutely nailing it with the Cosmic Cobalt!

  • RL
    rochelle l.
    Verified Buyer
    Reviewing
    Cosmic Cobalt Color Depositing Treatment Mask
    I recommend this product
    Pre-Bleached? Yes
    Starting Shade Light - Medium Blonde
    Hair Texture Curly
    Product Standouts Vibrant Color, Hydrates , Curl Friendly, Easy To Use
    Age 25-34
    Rated 5 out of 5 stars
    1 week ago
    Beautiful blue

    This color came out so well! I was really impressed with the vibrancy. Everyone says my curls have been looking healthier too, which is a good sign Overtone has a good formula. Also super easy to use!

    Was this helpful?
  • RL
    rochelle l.
    Verified Buyer
    Reviewing
    Cosmic Cobalt Color Depositing Treatment Mask
    I recommend this product
    Pre-Bleached? Yes
    Starting Shade Light - Medium Blonde
    Hair Texture Curly
    Product Standouts Vibrant Color, Hydrates , Curl Friendly, Easy To Use
    Age 25-34
    Rated 5 out of 5 stars
    1 week ago
    Beautiful blue

    This color came out so well! I was really impressed with the vibrancy. Everyone says my curls have been looking healthier too, which is a good sign Overtone has a good formula. Also super easy to use!

    Was this helpful?
  • RO
    Robin O.
    Verified Buyer
    Reviewing
    Cosmic Cobalt Healthy Color Duo
    I recommend this product
    Pre-Bleached? No
    Starting Shade Dark Blonde - Light Brown
    Hair Texture Wavy
    Product Standouts Easy To Use, Good For Brown Hair, Curl Friendly, Hydrates , Vibrant Color
    Age 35-44
    Rated 5 out of 5 stars
    3 weeks ago
    Love the color

    So easy to use and no bleaching. I don't have to destroy my hair to get the color I want. So vivid.

    Was this helpful?
  • AT
    Allison T.
    Verified Buyer
    Reviewing
    Cosmic Cobalt Color Depositing Daily Conditioner
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    Worked great

    Have had mixed results with some colors but the blue works great and is very vivid

    Was this helpful?
    oVertone Color
    4 weeks ago

    Thanks for the review, Allison! We're so glad to hear that the Cosmic Cobalt worked great for you and gave you that vivid blue color you were looking for! We totally understand that different shades can perform differently depending on your hair type and starting color, so it's awesome that you found one that really delivers the results you wanted. Your feedback about the blue being particularly vivid is really helpful for other customers who are looking for that bold, eye-catching color payoff. Thanks for taking the time to share your experience with Cosmic Cobalt!

frequently asked questions

Will Cosmic Cobalt show without bleach? (HERO)

It shows best on lightened hair. On dark hair, it appears navy-toned.

Is Cosmic Cobalt very bright?

Yes, on blonde hair.

Does blue fade slowly?

Yes, blue pigments linger longer.

Will it stain?

Likely; gloves recommended.

Is Cosmic Cobalt damaging?

No.

How long does Cosmic Cobalt last?

Longer than pink shades.

Does it fade green?

It may soften toward blue-green.

Is it bold or muted?

Bold on light hair.

Will it show on black hair?

Very subtle.

How do I maintain Cosmic Cobalt?

Use a blue Daily Conditioner.

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WHAT’S INSIDE? ONLY THE GOOD STUFF.

We’re serious about what goes into our products - cruelty-free, vegan and focused on
blending performance with hair health. Because why compromise when you can have it all

INSIDE THE MASK

Where healthy hair and real color meet.

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