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Rainbow Toned Silver Bars

Why don't we see more rainbow "bars"? This came to mind from a bar I just saw on ebay:
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Oh, and I dont know why.
-YN Currently Collecting & Researching Colonial World Coins, Especially Spanish Coins, With a Great Interest in WWII Militaria.
My Ebay!
The rough finish on poured bars does not seem to develop tone as easily like the satiny smooth or prooflike mirror finish on a struck bar.