It depends- silver plating or sterling silver will tarnish - that tarnish is normally black in color- can be removed with silver polish or a tarnish removing rag - also something called "Never Dull" that comes as a roll in a can and small sections can be cut off to clean metal cue joints, etc.
Also, some cues - as back in the 70s- such as Palmer third catalog cues, were finished with an epoxy based finish- those cues will develop a yellow patina over time in the wood sections and if the finish is also over any silver rings, etc. the metal will take on a GOLD appearance which can only be removed with a complete cue refinish.
Perhaps your cue has a epoxy based finish that also ran over some metal sections of the cue