For quite a few years now, I have tried to harness the power of the sun to heat my mordant pots and extract some dyes. I bought some great clear 5 and 2 1/2 gallon buckets with clear lids from a restaurant supply place. They were sort of expensive, as I remember, but I have been using them quite a while now and since they were good quality plastic, they are holding up well. With lids on tight, the liquids in the buckets get pretty hot on a warm summer's day. Too hot to hold your hand in the liquid.
|Handspun wool dyed with madder roots.|
8/2013 I just found this little U-Tube Video about dyeing with madder root. Not a lot of information, but instructive about not getting the roots too hot.