Assertion: red phosphorus | /r/HasProperty | discovered
Facets:
Source sentences:
text: Red phosphorus was first discovered when the Anton von Schrotter, an Austrian chemist, heated white phosphorus to 300oC. Some other important methods to obtain red phosphorus are discussed in this subsection.
text: When red phosphorus was discovered, with its far lower flammability and toxicity, it was adopted as a safer alternative for match manufacture.