Answer:
The weapon of choice to create the biggest shock.
Different lights do make me strange, thus into different sizes I will change
So cold, damp and dark this place. To stay you would refrain, yet those who occupy this place do never complain.
I pass before the sun, but make no shadow.
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?