- a colorless, crystalline powder, C14H12, obtained from coal tar and having a violet fluorescence: used chiefly as a source of anthraquinone and alizarin, and in the process of measuring radioactive materials.
- a colourless tricyclic crystalline solid having a slight blue fluorescence, used in the manufacture of chemicals, esp diphenylamine and alizarin, and as crystals in scintillation counters. Formula: C 6 H 4 (CH) 2 C 6 H 4
- A crystalline hydrocarbon that consists of three benzene rings fused together. It is extracted from coal tar and is used to make dyes and organic chemicals. Chemical formula: C14H10.