When used in the extemporaneous preparation of topical medications, it is supplied in the form of coal tar topical solution USP, which consists of a 20% w/v solution of coal tar in alcohol, with an additional 5% w/v of polysorbate 80 USP; this must then be diluted in an ointment base such as petrolatum.
Hiram Rhodes Revels, R-Miss. Revels was the first African-American to serve as a state senator, representing Mississippi. Revels was elected by the Mississippi State Senate to fill a vacant U.S. Senate seat, which was abandoned by Albert G. Brown when Mississippi seceded from the Union during the Civil War.
During Reconstruction, only the state legislature of Mississippi elected any black senators. On February 25, 1870, Hiram Rhodes Revels was seated as the first black member of the Senate, while Blanche Bruce, also of Mississippi, seated in 1875, was the second. Revels was the first black member of the Congress overall.