High Quality Content by WIKIPEDIA articles! Platinum prints, also called platinotypes, are photographic prints made by a monochrome printing process that provides the greatest tonal range of any printing method using chemical development. Unlike the silver print process, platinum lies on the paper surface, while silver lies in a gelatin or albumen emulsion that coats the paper. As a result, since no gelatin emulsion is used, the final platinum image is absolutely matte with a deposit of platinum (and/or palladium, its sister element which is also used in most platinum photographs) absorbed slightly into the paper. The first person to have recorded observing the action of lights rays on platinum was Ferdinand Gehlen of Germany in 1830. The following year his countryman Johann Wolfgang Dobereiner determined that the action of light on platinum was quite weak, but that perhaps something could be combined with platinum to increase its sensitivity. Through experimenting, he eventually found that ferric oxalate was the missing ingredient. The combination of these two metals is still the basis of the platinotype process in use today.

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