Coal tar is a brown or black liquid of extremely high viscosity. Coal tar is among the by-products when coal is carbonized to make coke or gasified to make coal gas. Coal tars are complex and variable mixtures of phenols, polycyclic aromatic hydrocarbons (PAHs), and heterocyclic compounds, about 200 substances in all.
Read more about Coal Tar: Safety, Coal Tar Distillers
Famous quotes containing the words coal and/or tar:
“Coal is a portable climate. It carries the heat of the tropics to Labrador and the polar circle; and it is the means of transporting itself whithersoever it is wanted. Watt and Stephenson whispered in the ear of mankind their secret, that a half-ounce of coal will draw two tons a mile, and coal carries coal, by rail and by boat, to make Canada as warm as Calcutta, and with its comfort brings its industrial power.”
—Ralph Waldo Emerson (1803–1882)
“The master, the swabber, the boatswain and I,
The gunner and his mate,
Loved Mall, Meg, and Marian and Margery,
But none of us cared for Kate;
For she had a tongue with a tang,
Would cry to a sailor, ‘Go hang!’
She loved not the savour of tar nor of pitch,
Yet a tailor might scratch her where’er she did itch:
Then to sea, boys, and let her go hang.”
—William Shakespeare (1564–1616)