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Platinum tones range from warm black, to reddish brown, to expanded mid-tone grays [clarification needed] that are unobtainable in silver prints. [ 1 ] [ dubious – discuss ] Unlike the silver print process , platinum lies on the paper surface, while silver lies in a gelatin or albumen emulsion that coats the paper.
Selenium toning is a popular archival toning process, converting metallic silver to silver selenide. In a diluted toning solution, selenium toning gives a red-brown tone, while a strong solution gives a purple-brown tone. The change in color depends upon the chemical make-up of the photographic emulsion being toned.
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Naturally occurring platinum and platinum-rich alloys were known by pre-Columbian Americans for many years. [5] However, even though the metal was used by pre-Columbian peoples, the first European reference to platinum appears in 1557 in the writings of the Italian humanist Julius Caesar Scaliger (1484–1558) as a description of a mysterious metal found in Central American mines between ...
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Multi-Platinum means 2,000,000+ certification units; From 2004 through July 2006, the certification level was 100,000 downloads for Gold and 200,000 for Platinum. When the RIAA changed the certification standards to match retail distribution in August 2006, all Platinum and Multi-Platinum awards for a digital release were withdrawn.
An elevator suddenly dropped around 200 meters (656 feet) while carrying workers to the surface in a platinum mine in South Africa, killing 11 and injuring 75 — 14 of them critically, the mine ...
Platinum was first used for minting coins in Spanish-colonized America. Following the discovery of platinum in gold rocks, the Spaniards were unable to use it for a long time because they had no technology for processing this metal. The then-cheap platinum was used for various kinds of frauds, such as substituting it for the more expensive silver.