I recently scored a really nice slab of curly maple. I've read about using vinegar/steel wool stain to color curly maple so I gave it a go. I put a piece of steel wool and about one pint of white vinegar in one of my wife's tupperwares. A week later it looks like the tank of a porta-John.
Sanded the call to 320, wiped the stain on, quickly heated it with the torch (about 3 seconds), let it dry, then sanded from 320 through 800 and applied finish. As nasty as the stuff looks in the tupperware, I like what it does to the maple.
I included a piece of the same section of curly maple for color reference of what the stain did.