You're doing it the hard way. Assuming similarly wrapped rolls, you can quickly search them by weight. 90% halves weigh more than 40% halves weigh more than clad halves. Weigh a roll of 20 clad halves. Anything significantly heavier has billon or silver halves in it. I don't remember the exact numbers, but I'm thinking a billon half is like .5dwt heavier. The RedBook can give you exact numbers.
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