= Barium platinocyanide
<Barium platinocyanide> is a <salt> of the tetracyanoplatinate(II) anion, commonly encountered as a hydrate. Its structure contains coordinated cyanide groups around platinum rather than free cyanide ions alone.
Its visible <fluorescence> under irradiation made it useful as a screen in the <Röntgen X-ray discovery experiment>. The screen converts otherwise invisible incident radiation into an optical signal.
<On a New Kind of Rays by Wilhelm Conrad Röntgen>[1895 communication: fluorescence of a barium-platinocyanide screen]{ref}
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