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Fantasy · Level 4

Cobalt Blue Gray Coverage, Honestly Rated.

Cobalt Blue offers full gray coverage. Full gray coverage — formulated pigment fills resistant white strands completely.

If resistant whites are the job, this shade does it without a separate base color — one appointment, full camouflage.

By the Hair Color editorsReviewed by the Hair Color editorial teamTested in the virtual studio

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cool · level 4Pin it
Bleach
Not needed
Gray coverage
full
Upkeep
high
Fade
Blue deepens to navy before lifting over 4-5 weeks.

Cobalt Blue Gray Coverage, Honestly Rated — FAQs.

Does Cobalt Blue cover gray hair?

+

Full coverage — pigment fills resistant white strands completely, no separate base color needed.

Does Cobalt Blue need bleach?

+

Usually not — level 4 can be reached on most bases without lift. Very dark or previously colored hair should still strand-test first.

How often must Cobalt Blue be refreshed on gray regrowth?

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High upkeep: toning refreshes every 2–4 weeks plus cold-water washes and heat protectant every time.

Compare with similar shades.

Cobalt Blue overview

Midnight Blue

Level 2 · fantasy

Black-blue ink with a sapphire flash in daylight. Edge you can wear to the office.

  • No bleach
  • Covers gray fully · Medium upkeep
  • Indigo sheen holds 4-5 weeks.
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Emerald

Level 4 · fantasy

Gemstone green with blue undertones — a jewel-toned statement that stays salon-smart on deep bases.

  • No bleach
  • Covers gray fully · High upkeep
  • Green fades to teal then sea-foam over 4 weeks.
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Teal Pool

Level 5 · fantasy

Blue meets green in a vacation-toned pool — juicy, glossy, and unmistakably fantasy.

  • Bleach required
  • Partial gray blend · High upkeep
  • Teal splits toward blue and green as it fades over 4 weeks.
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