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:
“Mr. Christian, it is about time for many people to begin to come to the White House to discuss different phases of the coal strike. When anybody comes, if his special problem concerns the state, refer him to the governor of Pennsylvania. If his problem has a national phase, refer him to the United States Coal Commission. In no event bring him to me.”
—Calvin Coolidge (1872–1933)
“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)