He started a fire using coal.

He is drawing a picture using charcoal.

Mr. Tan is my best friend.

He works digging out coal.

Ammonium carbonate is a compound commonly used in inorganic chemistry.

My grandfather used to work in charcoal production.

We have developed a new method to produce charcoal from wood.

This factory manufactures iron using coke.

I always use binchotan charcoal when I grill meat.

I always use binchotan charcoal when I grill meat.