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.
What goes around the wood but never goes into the wood?
I'm white and used for cutting and grinding. When I'm damaged, humans usually remove or fill me. For most animals I am a useful tool. What am I?
What two keys cannot open any door?
Oh lord! I am not worthy! I bend my limbs to the ground. I cry yet without a sound. Let me drink of waters deep. And in silence I will weep.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.