I’ve been dyeing a whole fleece into 100g lots mixing my own colours from primaries from Colourcraft acid dyes bought from George Weil.
I’ve gone into detail about this here, but the colours are zinging.
Pink, greens, dark red, yellow and orange. I’ve just completed a blue, but it’s still wet so will have to wait to be added later on. I added another batch of fleece to the finished due bath to exhaust it totally, which gave me a pretty pale blue.
I’ve also tried stove-top rainbow dyeing. More about that can be found here.