This is my current practice piece. I think it will probably wind up as the top of a box with Celtic knot work on the sides. Even when I don't have a repousse commission I like to keep in practice.

Repoussé tools tumbled clean after hardening.

They were tumbled in a sawdust/course hand rubbing compound mixture. (available at your local auto parts/paint store)
This removes all the caked black oxides and cooked on corn oil from quench.