coal-based substance
nounUK /kəʊl beɪst ˈsʌbstəns/
US /koʊl beɪst ˈsʌbstəns/
A coal-based substance is something made mostly from coal.
The factory turns coal into a coal-based substance used to make dyes.
OTHER MEANINGS
2. A material produced by treating or processing coal for industrial use.
Pitch is a coal-based substance used in making electrodes.
3. Any chemical mixture whose main ingredient comes from coal.
Scientists studied a coal-based substance that could replace oil in plastics.
4. A fuel or raw material derived from coal rather than petroleum.
The plant switched to a coal-based substance to lower costs.