Harvesting Color by Rebecca Burgess, that I highly recommend if you are interested in natural dying, she dyes up a rainbow of chunky yarns and it just looks beautiful!
I used Logwood Purple for this. After reading about Logwood I probably won't use it in the future because it is not an easily sustainable dye and I can not gather it myself. It came in my little kit so of course I am going to use what I have but there are sooo many natural dye plants out there I see no reason to use one that is not abundant! I can see why it is in high demand though ,it is a beautiful color!
I also learned why they put rubber gloves in my kit that I ..umm...did not use...yikes!