3 warning signs silver could be headed for a deeper plunge, according to a top commodities expert

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• Silver crashed on Friday, but it could be on the verge of a deeper plunge if the market flashes a handful of signals.
• CPM's Jeffrey Christian said he saw silver potentially dropping another 17% to $68 an ounce.
• He said he was watching for three signals in the market that would hint at a bigger drop to come.

Silver took a historic plunge on Friday, but there are signs traders should look out for that could suggest the pain isn't over.