I decided to give solar dyeing a go on the weekend. There were two reasons why.
1. I didn't want to risk felting my handspun (I sometimes don't watch very closely and my water starts to bubble), and
2. We are having a heatwave here - I may as well make the most of free heat!
So I started with rather unprepared wool - I quickly soaked it in some warm water. Then I added some hot tap water to my turquoise dye and citric acid (first time using citric instead of vinegar) and poured it into a strong freezer bag, then placed the wool in and tied it up. I placed it into a big saucepan, so that if the bag broke it would be contained.
Then out to the solar oven that my husband constructed ages ago and in it went. I put it in at about 3:30pm, so there was only a few hours of heat left for that day. Most of the dye had been absorbed by about 6pm but I figured I may as well leave it overnight and give it another day of heating.
At the end of day 2, the water was completely clear and when I took it out of the oven (must remember pot mitts next time) the water was at ~65C! Not bad! Again, I left it overnight, this time to cool down completely (that took a lot of patience let me tell you).
When I rinsed, there was no dye leak, and no vinegar smell :) I have read that turquoise dye can be a terrible one to get to stick, so I am very happy that mine didn't wash out.
All in all, I am very happy with the results, and while we have hot weather, I shall certainly be doing more solar dyeing, as it doesn't heat my house up, and uses free energy :) Win win I say!