Period 6 element
Platinum is a chemical element with the chemical symbol Pt and an atomic number of 78.
Platinum print
In photography, the "palladiotype" is a less-common variant of the platinotype. The process came into greater use after World War I because the platinum used in the more-common platinotype quickly became too expensive. Due to the rising cost and the consequent shortage of commercial platinum paper, photographers tried to replace the platinum with the much cheaper palladium which gave similar effects. The cost of this metal, however, also started to rise and eventually around 1930 the process was abandoned in favor of more economical alternatives. In recent years, a handful of photographers have taken up the art of mixing platinum and palladium and printing fine art prints with those chemicals, despite its cost.