Question

अशी कोणती वस्तू आहे जी विकत घेताने काळी असते वापराने लाल असते आणि फेकुन देताने पांढरी असते

Answer 1

What is such a thing that is black after buying is red using and throwing it white?

That would be charcoal. It's black when you buy it in the back. It turns red when used because it generates so much heat that it turns red when a lot of oxygen is exposed it it. And it looks grey when your done because of the ash.