Question

A thing that we buy it look black and when we use it look red and after use white​

Answer 1

Answer:

It is Charcoal

Explanation:

Charcoal is black when we buy it or when not being used. It gets red in appearance when put in use means to say when burning. And eventually when it's been consumed by fire or after getting burned out or used up, changes into ashes which look grey in color.