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Which platinum-group metal has a bluish-white color?

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rhodium — platinum group Rhodium foil and wire.

The platinum-group metal characterized by a bluish-white color is osmium.1

While osmium is often described as a gray-white metal, it is specifically noted for its distinct bluish-white appearance. It is the densest naturally occurring element and possesses the highest melting point among the platinum-group metals.1