From my personal "You're doing it wrong" department...
A long, long time ago, I got a PAGST helmet, and a woodland cover with it. Since black was tacti-cool with the people I associated with, I wanted a black colored cover. Didn't want to buy it, because, hell, there's an entire shelf of RIT dye at the store, right?
So, I boiled that cover black, rinsed it until no more black came out. Looked the HEAT!
....until one day, I was standing in the rain, battle rattled up, waiting for an ignorant guy to become stupid, and I rubbed my nose. It was black.
I look down, and the rain had dislodged/washed/whatever black dye out of that fucking cover onto me, my gear, and oh...
it was EVERYWHERE. And, oh sure, NOW it didn't want to come out.
I have used dyes since then, to make a ghille, and it looks great, but I guarantee you nothing valuable is going to be around it unless I can deal with forest colored stains on it. Lesson learned.