Red Phosphorus
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During the 1840's red phosphorus began to be produced: initially by
heating white phosphorus (P4) in a sealed glass vessel at 250 ºC for several
days. Red phosphorus is an amorphous phosphorus polymer, it is denser than
white phosphorus and has a higher melting point, it is also more resistant
to oxidation, less reactive and less toxic. As a result red phosphorus
is much safer to handle. Arthur Albright developed a reliable method of
preparing red phosphorus from the patented method by Professor Anton von
Schrötter. Albright's method is similar to the procedure used today
whereby white phosphorus is heated at 260 ºC for five days, without
air, and then heated to 400 ºC to distil off unreacted white phosphorus.
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