Red phosphorus

(redirected from amorphous phosphorus)
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(Chem.) an allotropic modification of phosphorus, obtained as a dark red powder by heating ordinary phosphorus in closed vessels. It is not poisonous, is not phosphorescent, and is only moderately active chemically. It is valuable as a chemical reagent, and is used in the composition of the friction surface on which safety matches are ignited.
(Chem.) See under Phosphorus.

See also: Phosphorus, Red

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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On the other hand, P additions are made with flux containing amorphous phosphorus.