Answer:
I am black when I am clean and white when I am dirty?
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
A tree with 5 branches, no leaves and no fruits
By Moon or by Sun, I shall be found. Yet I am undone, if there's no light around.
What is that which, though black itself, enlightens the world without burning?
You use it between your head and your toes, the more it works the thinner it grows.