Silver plated Roman coins

Ill get some pics up tomorow, but for starters heres what I know. Ive read that the Romans did silver plate some of their coins for circulation. Some a silver alloy dissolved none silver and stuck it, others were sheets heat welded together then struck out. Also many fakes were made to circulate. Now for my question...How do I tell these apart, or do I just send them off to NGC in hopes they come back authentic or contemporary conterfeits.
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