I have a number of old ARC-5 receiver capacitors and choke on which what I assume is cadmium plating over the brass "flower-pots" has oxidized to a white powder. I am thinking of buffing this off and having them replated. However, it seems to me that I have read somewhere that cadmium oxide is poisonous. Is this true, and if so, HOW poisonous? Ken W7EKB