Oh Boy! One of my fav knitting websites has in the Spring issue lots of stuff about spinning, spindles and wheels ..and -wow-dyeing wool for spinning! Which is a current focus of mine : how to simplify the process of permanent dyeing of wool. This webpage from knitty.com is the best yet. http://knitty.com/ISSUEspring06/FEATKSdishwasherdyeing.html
I and also seen a few other interesting techniques, like using colored tissue paper; a French website has a good overview of the process. I tried it and have come to the conclusion that the dyes used in France must be more “runny” but I did mange to get a raspberry, red, other pinks and purple roving done- all rather more pastel than I prefer. Just in case you are curious:
I used a free online translation service and it was very funny to interpret, their rendition. Anyway- color is cool!