In 2006, I took a class in yarn dyeing. The woman had been a fabric dyer for years and well as dyeing fiber for weaving. It was a wonderful class because I was the only student and what we did was play after all the instructional stuff.
I had brought in three skeins of Katia Ingenua to try to over dye. No one thought it would turn out the way it did. It was not rocket science either, we just skeined the yarn on a swift, tied it up, shoved it into a large zip lock and I dumped different colors of dye into them. It came really cool though.
Well, I was taking stash pictures for my Ravelry account (ID: Kamala) when I found them. So below is the original color and the new over dyed one.