The best blue hair dye for the perfect blue hue

If you're committed to the blue crew, you'll want to go down the permanent hair dye route, and no one does that better than Schwarzkopf. This Blue Mercury shade has a beautiful metallic tinge that shimmers in the light.

Amazon review: "I wish I'd found this a long time ago! This is fantastic stuff. I have very dark gunmetal-grey hair and I used to have to bleach it twice, then tone it to get the yellow out, and then apply the colour, which would then bleed constantly, getting on towels, staining the sheets, staining the entire shower and tub, even my fingernails and fingertips if I scratched my head. What a pain!

With this, I just have one step. I apply this. That's it. Done. I still get a good, true blue. No green. No grey. The photo on the box actually is not as pretty as it turned out on my head. I actually got a really nice cobalt blue. I was not expecting that, and I'm absolutely delighted by it! I've just bought my second box too, and will be continuing with this product from now on!"

Don't want to commit to the blue crew quite so strongly? We get it. Crazy Color has these amazing 100ml bottles of semi-permanent hair dyes that'll have you experimenting with a new look for summer. They have regular blue, but we're a fan of the sapphire blue - dark and mysterious.

Amazon review: "I have used this particular colour a couple of times as well as a different shade of blue. This brand is fabulous, it's highly pigmented, distributes evenly & captures every hair thoroughly. I've never had issues or patching... This took straight away and fixed the mess that my hair was in!

The only issue is, is that this colour transfers so easily and for quite a while. My coat kept getting a blue shadow all over it, had to use a towel over my pillow for a few weeks, it would run down a little if I'd done exercise and was sweating. It would mark my ear and neck if it touched it & kept staining my hands. I did look for several methods to stop this & I found to use conditioner and leave it in for a while and rinse with cool water helped reduce it from happening. This doesn't deter me from buying the product as this is one of my go-to's as it's incredible!"

If you're looking to get a custom shade of blue that you can't find on the box-dye shelves, Shrine has you covered. Using only one bottle, you can create up to 30 full head colours and achieve a spectrum of unreal results, which you can build up over the course of weeks. Shrine's top tip? Purchase the blue and indigo drop kits and mix them to achieve an unreal indigo-purple hair dye shade.

Shrine review: "Love this blue drop-it kit, you can get a massive range of colours from it, from pale baby blue to electric blue. Totally lush. So easy and quick to apply and it doesn't have a bad smell to it."

Pastel princesses, rise up. Live your light blue hair dreams with Bleach London's BLULLINI semi-permanent cream. Ideal for those who want a change but not a super-long commitment, Bleach London's formula sticks around for one to 30 washes. Perfect for those who want to recreate Phoebe Bridger's gorgeous locks from the Met Gala.

Look Fantastic review: "Easy to use hair colour, I used mine on my bleached hair and it's amazing - five stars!"

Arguably the most popular shade of blue, aqua is fun, memorable and inviting. Any gal rocking an aqua-blue hue knows how to have a good time. Stargazer's semi-permanent hair dye can last up to 15 washes in pre-lightened hair and eight washes in un-lightened hair.

Amazon review: "I got tired of my hair fading and wanted to look for something that wasn't as damaging while my hair still grows out but I don't want to chop, so I bought this dye. I haven't been using any colour shampoos or conditioners and the colour has barely faded at all after about 5 washes. It didn't make my hair feel that dry either, but I already had very dry hair so I wouldn't have seen a massive difference either way.

I'm very happy with the colour it turned out to be (my hair was bleached with a faded blue underneath) I do warn anyone that dying your hair blue might leave it faded green, but I don't really care and this happens to 99% of blue dyes. Overall I'm really happy."

Want to dye your hair but don't want to bleach it? Don't get the blues (hehe, get it) because Garnier Nutrisse Hair Dye is ideal for our dark-haired girls. This gorgeous midnight blue shade works on all hair textures and is visible even on dark hair without the need for bleach.

Amazon review: "This is a good choice for permanent hair colour and really does take well. I like the idea of using this as it seems less harsh on your hair compared to several other brands. I have shortish hair and there was plenty in the bottle for me. Being naturally very dark brown, this took instantly, and the colour really is rich and vibrant, with a hint of blue which you can catch in the light.

Just a personal note, I found the mixture extremely runny when applying it for the first time, so much so that it ran a little too quickly when I first applied it to my hair (hence my 4 stars not 5). However, for a good overall result and at a good price, I would definitely recommend this."

For those who frequently use dark hair dyes but want to try something a bit different this time around, L'Oréal's Colorista can deliver you a beautiful black shade with a subtle shimmer of mesmerising blue. This permanent gel colour will last you up to eight weeks and offers 100% grey coverage.

Amazon review: "This is the only black hair dye that doesn't attach to my facial skin... it can be incredibly hard when using a black hair dye to not get any hairline mishaps as it's so dark, others I've used even with Vaseline around my face, still stain and refuse to wipe off or fade from my skin, not even I believe sulphuric acid would burn the stain away! However, this hair dye seems to wipe off easily when you've made a mistake and after a few cleanses the stain is gone!

It's a lovely vibrant colour and the blue is only present when in sunlight or beneath a light bulb in winter lol overall it's a good hair dye that covers greys and lasts a long time with hardly any fading! Until your greys come through again ha!"