History of anthracite coal mining in Pennsylvania occurred with the New York prices (Latzko, 17). The usage of anthracite coal in the iron industry increased demand for hard coal. Since the late 18th century coke (bituminous coal with the impurities burned away) was used as fuel to make iron in Britain. With the spread of popularity of anthracite in the early 19th century, iron makers began experimenting with using anthracite as fuel in iron production. It wasn’t until 1840 when David Thomas introduced Welsh hot blast technology to the Lehigh Crane Iron Company that anthracite was successfully used to smelt iron. It was indicated that using anthracite
Anthracite budgerigar mutation now be determined. It seems likely that the Anthracite is the re-emergence of the English Grey. A bird with two Anthracite factors has an extremely dark grey body, jet black markings and the cheek patches of the same very dark grey as the body. G W von Kamrath describes them as "jet black wing and tail markings and deep black cheek patches". A single Anthracite factor has a similar effect to the Dark mutation, causing a Skyblue to become Cobalt in appearance. The Anthracite mutation appeared in Germany in 1998 in the aviaries of Hans-Jürgen H Lenk, who successfully established