Ten years ago, sports trad-ing-card company Donruss started selling "jersey cards," player cards that included a tiny swatch of a hero's uniform. Beginning with a card for Indianapolis Colts quarterback Peyton Manning, the Arlington, Tex. company has made millions of these collectibles. Also busy making jersey cards: counterfeiters.rn"In some cases, we couldn't even tell what was real and what was fake," said Scott Prusha, spokesperson for Donruss. "There was dearly a problem." Fans aren't going to pay an extra $15 to $1,000 for a trading card if they aren't confident the thing is real.rnTo squelch the pirates, Donruss this year embedded an invisible marker into its cards, a trace amount of a chemical made by Eastman Kodak.
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