When oil burns, carbon is released in the reaction, forming a sooty covering on the inside of the lamp. Lampblack was also often mixed with olive oil or balsam gum to make ink.
And ancient Egyptians sometimes used lampblack as eyeliner.
As an element, carbon occurs in a striking variety of forms.
Coal, soot, and diamonds are all nearly pure forms of carbon.
One of the most common forms of carbon is charcoal.