In this example, only 1/10th of the weight was sterling! Rest of weight was from the ceramic/resin form. Note that sometimes the filler can be sand. After removing the filler/form, all you are left with is a "skin" of sterling. Yes, 10 ounces ended up being only 1 ounce of sterling silver.
It kind of looks like opening a can of jellied cranberry sauce.
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