ION Sky Blue

Swimming is always a different kettle of fish, so you'll have to find someone that has actually used it and been swimming a lot. There's a lot of very long lasting blues on the market, but they will act quite differently when swimming. I've found that directions turquoise lasts fairly well to a pastel when swimming 3-6 times a week without a cap, but tends to go greener. A bit of pink in conditioner helps that though. I've not used ion.

But if you only dye your hair shades of blue (purple is still basically a blue), then why not just try it?

One youtube reviewer said it faded to pastel within a month. Other claim it stays vibrant for much longer. I prefer the latter and it's not worth trying otherwise. Is there anyone here with experience using this colour? Thanks

It's always worth trying. They all work differently for different people 🙂 you might go with what the majority say, but you could be missing out on a good thing. And as I say, swimming is a whole different matter to most people's experience.

Ion sky blue is as close to a permanent dye as you can get (and i mean permanent in the literal sense, 'permanent' dyes are actually easier to remove) so if it doesn't survive regular swimming sessions nothing will.