I work in a library and, well I guess most people don’t know this, but libraries run regular programs. Since I am a crafty person and especially interested in textiles and textile crafts, I do a lot of programs that involve quilting and dyeing.
Using the same directions I used for onion skins, we dyed annatto seeds. Annatto seeds are red seeds that are used in Latino cooking, most particularly Puerto Rican cooking. Thus, they are totally non-toxic.
Here is a cotton towel dyed with annatto seeds. It is a lovely sunflower yellow.
One of my students preferred to dye lambswool, worsted weight. The yarn had more orange to it. A really beautiful color.