I dyed some Debbie Bliss Pure Silk yarn over the weekend. I used Pebeo QuickColor in turquoise with dark blue, and a little green & yellow. I saw a demonstration of using this dye for yarn the previous weekend at the Unravel festival at Farnham Maltings.
It didn't come out with the different colours as distinct as I would have liked, but I'm happy enough with the result to use it. I'll probably make a shawl.