Chrome has a bluey tinge to it when you look down the bore against the light, cast iron is normally just dull-ish.
You can also sometimes see where the chroming finished at the end of the bore, usually it starts to flake after a few years.
LISTARD (Not Listar D, Stan) was the trade name, but there were others like CHROMARD which was another cylinder chroming process, and there were other still that I cannot put a name to. Hepolite had their own process for example.
Peter