Historically Everdur is not technically a bronze because it does not contain tin. It would however be a copper alloy.
If all you are interested in is historical bronze then yes it was
copper and tin with various other metals as impurities but for at
least the last 50-75 years the following definition has been in
place.
Broadly speaking, bronzes are copper alloys in which the major
alloying element is not zinc or nickel. Originally "bronze"
described alloys with tin as the only or principal alloying
element. Today, the term is generally used not by itself but with
a modifying adjective. For wrought alloys, there are four main
families of bronzes: copper- tin-phosphorus alloys (phosphor
bronzes); copper-tin- lead-phosphorus alloys (leaded phosphor
bronzes); copper-aluminum alloys (aluminum bronzes); and
copper-silicon alloys
From the Copper Development Association website (
http://tinyurl.com/2nqgpr) (silicon bronzes).
It is not a marketing ploy but an attempt to classify various copper
alloys in a systematic fashion. Bronze alloys are a harder more
durable class of alloys than the Brasses are so it makes since to
class the aluminum, and silicon bronzes along with the phosphorus
(tin bearing) bronzes.
Jim
James Binnion
James Binnion Metal Arts