Will IN1 Dark Indigo show up on black hair?

On natural black or very dark brown hair it adds a cool blue-black cast rather than a bright blue. The effect is most visible in sunlight and fades over several washes.

Can I use it on bleached or blonde hair?

Yes, but expect a much stronger, sometimes inky blue result. On very light hair the indigo can look flat or uneven, so a strand test first is wise.

How many boxes do I need?

One box suits short to shoulder-length hair. For long, thick or very dense hair, buy two boxes so you can saturate the roots and ends evenly.

How long does the color last?

It is permanent, but the blue tone fades gradually over roughly four to six weeks. Cool tones often wash out faster than warm ones, so color-safe shampoo helps.

Does it cover gray hair?

Yes, the permanent formula covers gray, though the indigo tone may read darker and less blue on gray strands. A strand test shows how it will look.

The kit includes the color creme, developer, an after-color conditioner and gloves. You supply a towel, a timer and a comb.

Garnier Nutrisse Ultra Color IN1 Dark Indigo

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Our take on the Garnier Nutrisse Ultra Color IN1 Dark Indigo

Garnier Nutrisse Ultra Color IN1 Dark Indigo is a permanent at-home hair color kit that pushes a deep blue-black indigo tone onto dark hair. It is part of the Ultra Color line, which is built for more visible color on dark bases than standard Nutrisse shades. The kit includes the color creme, developer, a nourishing after-color conditioner and gloves. It is a single-application box, so long or thick hair may need two kits.

Best forPeople with dark brown or black hair who want a cool blue-black tintShoppers who want permanent color without a salon visitAnyone wanting a drugstore-priced single-box color kit