Coal tar may be used in two forms: crude coal tar (...) or a coal tar solution (...) also known as liquor carbonis detergens (LCD).
The term creosote has a broad range of definitions depending on the origin of the coal tar oil and end-use of the material.
However, phototherapy can be effective when used in conjunction with certain topical treatments such as anthralin, coal tar, and vitamin A and D derivatives, or systemic treatments such as methotrexate and Soriatane.
Asphalt shingles may last 30–50 years. Coal tar built-up roofs may last forty or more years.
Phenol was first extracted from coal tar, but today is produced on a large scale (about 7 billion kg/year) from petroleum-derived feedstocks.
It was announced in 1973 that a team at the National Institutes of Health in the United States had developed a method for total synthesis of morphine, codeine, and thebaine using coal tar as a starting material.
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