Cosmic Cobalt Color Depositing Treatment Mask
previously known as Extreme Blue Coloring Conditioner
Can't decide which shade to go with?
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 2β3 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
How to use
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SEE IT. LOVE IT. TRY IT.
- LSLisa S.Verified BuyerReviewingCosmic Cobalt Color Depositing Treatment MaskI recommend this productPre-Bleached? NoStarting Shade Medium - Dark BrownHair Texture WavyProduct Standouts Boosts Shine, Good For Brown Hair, Easy To UseAge 55+Rated 5 out of 5 stars3 days agoI will always use this!
I've been using this product for several years now in the extreme purple and extreme blue on my mid to dark brown hair. I love the color tint it gives to my hair and I get compliments on it all the time. I've tried another brand and that brand just does not last as long as Overtone....I use the deep conditioner once every 3 weeks or so and that keeps my color going strong. Plus, it does condition my hair and makes it feel fuller and softer.
oVertone Color3 minutes agoHi Lisa! We're absolutely thrilled to hear you've been a loyal oVertone fan for several years - that kind of dedication means the world to us! It sounds like you've really mastered the perfect routine with the Extreme Purple and Extreme Blue on your mid to dark brown hair, and we love that you're getting compliments all the time - that's exactly what we want to hear! You're so right about the longevity compared to other brands, and it sounds like you've found the perfect sweet spot with using the deep conditioner every 3 weeks to keep that gorgeous color going strong. We're also thrilled that it's not just about the color for you - the fact that it's conditioning your hair and making it feel fuller and softer is such an amazing bonus! Thank you for being such a wonderful part of the oVertone family and for taking the time to share your experience with others who might be considering making the switch!
- JWJo W.Verified BuyerReviewingCosmic Cobalt Healthy Color DuoI recommend this productPre-Bleached? NoStarting Shade Light - Medium BlondeHair Texture StraightProduct Standouts Vibrant Color, Easy To UseAge 25-34Rated 5 out of 5 stars5 days agoLove this product!
This worked great in my hair. Usually non permanent dyes dont look great in my hair. This one turned out great.
- ARAnnie R.Verified BuyerReviewingCosmic Cobalt Color Depositing Treatment MaskI recommend this productPre-Bleached? NoStarting Shade Light - Medium BlondeHair Texture StraightProduct Standouts Vibrant Color, Boosts Shine, Hair Growth , Hydrates , Easy To UseAge 55+Rated 5 out of 5 stars6 days agoBlue
I love my blue. Just the back underneath section. Adds color and is fun.
- MBMetrice B.Verified BuyerReviewingCosmic Cobalt Color Depositing Treatment MaskI recommend this productPre-Bleached? YesStarting Shade Dark Blonde - Light BrownHair Texture CurlyProduct Standouts Vibrant Color, Hydrates , Curl Friendly, Easy To Use, Good For Brown HairAge 25-34Rated 5 out of 5 stars1 month agoNice, strong color
It's a really good blue and it works really well with the teal as well and the purple. I used it to blend the top portion of my hair from the turquoise and into the black portion of my hair, because I realized that I had missed a bunch, lol. But it looks nice besides the turquoise and the purple. But like with any of the other strong colors, I do recommend preparing your bathroom; because if you fling it anywhere that's not on your head, it will stain.
- KSKelly S.Verified BuyerReviewingCosmic Cobalt Color Depositing Treatment MaskI recommend this productPre-Bleached? NoStarting Shade Fantasy ShadeHair Texture WavyProduct Standouts Easy To UseAge 35-44Rated 5 out of 5 stars2 months agoCosmic cobalt
A rich color that looks amazing.
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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WHATβS INSIDE? ONLY THE GOOD STUFF.
Weβre 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.
