Ine foreign body in the eye -
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
Nickel
Copper
Iron
Silver
Ocular trauma 