I decided that what I wanted for my birthday was some purple silk yarn. Alas, I have no money in the yarn budget. But I do have a large cone of teal silk yarn. So I over-dyed it with a lot of red, and the initial result was a lovely eggplant color.
Then I washed it. It bled. And bled. And left purple spots all over the bathtub. And now it's back to teal. :( At least it's much softer after a good bath!