As for dying..... hmmmmm.. Look at these heritage carrots that my son bought for me. They are beautiful to look at, tasty to eat, and the water that you boil the reddish one in turns a fabulous purple/magenta colour - a gorgeous saturated shade. I couln't throw it out and wondered if perhaps I could....
I have never dyed anything in my life!
I plunked it in the hot water and left it for a couple of hours and when I looked at it , the thread was a subtle shade of what I call French blue. Pale but definitely there! I then rinsed it and let it sit in cold water with salt added - Why? I have no idea! It just seemed as I was supposed to do that.
I let it dry and then used it for the ball thread in this!