Any good guides for fashion dying?

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I bought cash shop fashion for the first time and was surprised when it came out green, lol! No harm done, I understand now that when you buy fashion, you receive a random color. But I'm hitting a roadblock where all the guides I've found about dying the fashion ...not green are either so old they don't exist or all the pictures are gone making them hard to follow.
Anyone know any good guides off the top of your head? Maybe someone here is very familiar with dying fashion and a good explainer?

I was trying to understand the different categories of dyes but I'm still a bit foggy about it. But if it helps, I'd be happy with white. Theres a really specific shade of plum that would also be really nice, if possible. I have no idea how to do that though.
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