RE> rit dyes

Rit is all I know about. If you follow the RIT directions and dump the feathers and/or fur into hot water (perhaps after washing with vineger etc) you need to be organized and careful. A moment or two too long makes for too much color, way too dark.

But if you drop a neck into room temperature RIT dye it will take one or two weeks to attain the desired color. That means you get to check once a day. And it still works out about as planned, even if you're a dollar short and a day late.