Answer:
What is black when you buy it, red when you use it, and gray when you throw it away?
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
When you buy me I am costly, but the only use I have is hanging only. What am I?
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I am the home for feathery animals.
It flows out of the soil, It burns you if it boils, And holds us in its coils, More valuable than gold, As black as it is old.