<prompt> Ine foreign body in the eye -NickelCopperIronSilver  <response>: Ine substances- glass, plastic, porcelain and metals like gold, silver, platinum and titanium no reaction Suppurative reaction is excited by pure copper, zinc, nickel and mercury paicles. Specific reactions are prodeuced by iron siderosis bulbi and copper alloys chalcosis. Ref : Parsons 22 nd edition, page no.395 