Ehm about the dyes thing, when I dyed my hair pink, first I used Crazy color's Flamingo Pink, but it lasted mmmh, 2 weeks? and it cost me about 12 dollars (which is a lot for me to spend on my hair). And it also damaged my hair a lot. But a friend told me to just use wood dye, you know? it's a colored powder that it's used to tint wood. Even though it sounded a bit aggressive on my hair I tried it anyways, because my idea was to shave it in about a month.
It actually turned out extremely well, I mixed in a bottle of conditioner (which cost me 1 dollar) half of the tint I had bought (1 dollar) and shake shake shake.
My hair turned out as a real flamingo pink, my hair wasn't damaged as I though it would be, and the colour lasted for 2 weeks, just like the fancy dye did, with the difference that with 4 dollars instead of 24 I dyed my hair twice in a month.
Here's about a week or so from the day I dyed it.