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Do you use sugar free because it's got to in the microwave, @neumannsalva ? Oh, that would be a good video tutorial :D
I remember someone called @luthvarian used to do really nice posts on textiles adventures like dyeing and spinning :D

I think I have written a very old post about dyeing... I hope I will have more time on Thursday, I will try to find it then
I have used a powdered food coloring I mixed with acid and water
2E9915FD-CDE4-4E9F-BEED-D4BE93553A0D.png
There is no sugar in this color. The other colors were liquid and from a Netherlands store, also without sugar... I guess sugar will felt the wool

Thank you, @neumannsalva - not that I'm planning to start dyeing 'yet'... :D

Ohhhh loook I found one old post on my Wordpress blog. This was my first attempt with wool which is made for spinning (scratchy) and was already dyed.
Maybe this helps a bit
http://www.blissandblisters.com/how-to-dye-wool-the-cheapest-version/

Oh, that's so interesting : no microwave ! It sounds really cool to do - I'm being tempted to start something new here, @neumannsalva, but I'm not colourist. It's really interesting to read about this process because I normally see people either microwave or 'boil' in a pan (without stirring), but I hadn't read about baking the fibre.