Brunswick Black is a varnish employed for coating over coarsely finished iron grates, fenders, &c., and is prepared by melting together asphalt, linseed oil, and oil of turpentine. For finer work, it has been superseded by Berlin Black, a similar composition of finer quality.
Brunswick Black
Chambers's Encyclopaedia, Volume 2: Beaugency to Cataract, p. 501
Source scan(s): p. 0512