platinotype

platinotype

[plat-n-oh-tahyp]
noun Photography.
1.
a process of printing positives in which a platinum salt is used, rather than the usual silver salts, in order to make a more permanent print.
2.
Also called platinum print. a print made by this process.

Origin:
1875–80; platin(um) + -o- + -type

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World English Dictionary
platinotype (ˈplætɪnəʊˌtaɪp)
 
n
an obsolete process for producing photographic prints using paper coated with an emulsion containing platinum salts, the resulting image in platinum black being more permanent and of a richer tone than the usual silver image

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