Garnier Olia 1.0 Night Black, oil-powered, no-ammonia. 100% grey coverage. Luminous, long-lasting, vibrant night black hair color with incredible shine and healthy feel.

Rich, natural looking light brown color with a glossy finish. Gentle, easy to apply, and long lastin, perfect for an at home refresh.

I use this shade regularly to touch up my roots, especially to cover greys, and it has worked really well for me. The colour 5.0 Brown gives a natural finish that blends nicely with the rest of my hair. The coverage is very good — it fully covers my greys and leaves a consistent colour without patchiness. Not having ammonia is a big plus for me, as the smell is much more pleasant during application and it feels gentler on my scalp. The conditioner included in the box is excellent. It leaves my hair feeling super smooth and soft with a really nice scent that lasts after drying. My hair looks shiny and healthy rather than dry. Overall, this is a reliable root touch-up option with strong grey coverage. I’ll continue repurchasing it.

Easy to apply and leaves hair soft with a vibrant, natural black color. Gentle formula with no ammonia—works really well!

Lovely colour, works well on light hair, results better then expected unfortunately fades quickly, hair feels and smells nice after use and looks good

Gorgeous coverage and shiny results after application. Easy to use and good value for money. The conditioner that comes with it helps keeps the colour vibrant.

Lovely colour rich and lasts but would definitely not recommend if you hair is bleached very light blonde as the colour fades very quickly

I'm sure the hair dye is great as I've been happy with Garnier in the past; but beware... If you're like me & not fluent in other languages. Mine turned up with instructions in another language, despite the listing showing the box in English. I'm going to have to see if there are any online, or if a friend can help me translate!

Such a bright, stunning colour - I'm often complimented on my hair colour when it's recently been dyed with Olia 7:40. One pack is not enough for my thick hair, even after I've just had it cut to shoulder length, so I always buy two. But at this price, it's still way cheaper than getting a hairdresser to dye it, so I have no complaints about the price at all. The colour is vibrant, the product is easy to use, and it works very quickly. I have not had any issues at all with skin staining - with other brands in the past I've had coloured patches on my neck, face and forehead for a couple of days after dyeing my hair, but that never happens with this brand. The colour lasts a long time - it is permanent, though the vibrancy decreases a tiny bit with each wash. My natural hair colour is 'mouse' but this dye is so permanent, even when it's long-faded you can see the difference between my mousey roots and the dyed lengths. It fades to a soft peachy 'strawberry blonde' which I can live with quite happily.