Keeping chalk on hand (or any white, absorbing powder—baking soda or corn starch are popular solutions as well) is a great way to nip these stains in the bud.

The white chalk gymnasts dust on their hands, feet, and legs helps absorb sweat and reduce friction, ... If you've ever been curious about what that powder is or why it's used, ...

That specialist says the "white powder" was chalk, much like the kind used for marking baseball fields. He said it appears as though there was a walking/running course laid out with directional ...