Its crimson flame-coloration was observed by C. G.
It may be solidified to rhombic crystals which melt at 5.4° C. (Mansfield obtained perfectly pure benzene by freezing a carefully fractionated sample.) It boils at 80 4°, and the vapour is highly inflammable, the flame being extremely smoky.
In the oxyhydrogen flame silver boils, forming a blue vapour, while platinum volatilizes slowly, and osmium, though infusible, very readily.
It burns with a pale-blue flame forming silicon fluoride, silicofluoric acid and silicic acid.
Like that of Natal the Transvaal coal burns with a clear flame and leaves little ash.