It's using logwood. Not sure if you can tell from this pic but there's very subtle color variations. Sadly I don't have a ball winder, so it took forever to wind this purple guy. I'm not sure what I'll make with it, socks no doubt. Sadly I don't have Cookie A's sock book, and I probably can't wait until Christmas (I'm assuming someone will buy me the book) to make something out of it, but that does mean I get to have fun browsing patterns on ravelry.