First time dying- was going for grey, got kind of there, but it got WAY bluer

Grey does need to be fairly light blonde. The more yellow the harder it’ll be. But, as it’s quite a dark grey it’s mostly ok, it’s really just the fade that’ll be an issue, but if we solve the blue tone it should be ok.

So, there’s no such colour as grey. What I mean is, it’s not a colour alone, they make grey dye by mixing other colours. The base colours being primary and secondary colours from the colour wheel. The problem with that is, some hair dye colours stick more than others. Whatever your dye is made from, one of them (my guess is red as that’s the one that usually washes away first) has washed away already and left more of the blue. So you now need to add back in a colour that neutralises that blue and brings it back to as close to grey as we can get.

Orange is the opposite colour on the colour wheel, so I’d suggest that. You’ll need an orange hair dye very heavily diluted with conditioner. Shampoo your hair and use it afterwards. Start off very conservatively and if it’s not enough, add a little more orange and try again. You can then use this each time you wash your hair if you need to.

I’d also recommend changing your hair washing routine. These dyes need special treatment to get your moneys worth, especially if you pay to have it done in a salon. Use the tips in this thread, as many as you can manage to fit in https://www.hairdyeforum.com/index.php/topic,11009.0.html it’ll seriously make a huge difference in how well your dye withstands.