The Collaborative International Dictionary
Platinotype
Platinotype \Plat"i*no*type\, n. [Platinum + -type.] (Photog.)
A permanent photographic picture or print in platinum black.
The process by which such pictures are produced.
Wiktionary
platinotype
n. 1 (context uncountable English) A method of making photographic prints using platinum salts 2 (context countable English) A print made by this method