From: phil_a@tpg.com.au   
      
   "flipper is an IDIOT "   
      
   >   
   >>But AgS is the most likely to form on pure silver & does with little   
   >>hesitation.   
   >   
      
   1. Silver oxide simply does not exist as a tarnish on silver metal.   
      
   2. The dark tarnish on silver is Silver Sulphide -  a good insulator.   
      
      
      
   "Silver is a very inactive metal. It does not react with oxygen in the air   
   under normal circumstances. It does react slowly with sulfur compounds in   
   the air, however. The product of this reaction is silver sulfide (Ag 2 S), a   
   black compound. The tarnish that develops over time on silverware and other   
   silver-plated objects is silver sulfide. "   
   http://www.chemistryexplained.com/elements/P-T/Silver.html   
      
      
      
   BTW:   
      
   Damn good thing silver oxide does not form on metallic silver at anything   
   like room temp - cos the stuff is quite poisonous.   
      
   All that silver tableware would have to be banned if it did.   
      
      
   ...  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)