Answer:
I am black when you buy me red when you use me when I turn white you know itβs time to throw me away.
I am heavy forward but backward I am not. What am I?
I donβt forget!
What is so fragile that saying its name breaks it?
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
What never gets any wetter no matter how hard it rains?