LAKE COUNTY, Calif. – The Lake County Chamber said this week that it has received reports of an increase in counterfeit $100 bills being passed at a local business.

Konocti Vista Casino saw a significant jump in counterfeit $100 bills on an evening earlier this week, the chamber reported.

The casino said the counterfeit bills passed the pen tests and went through their cash scanners.

Businesses are urged to look for a bill with a 2006 date and serial letters “EB.”

The bills have a “waxy” feel; the watermark and stripe is present, but the watermark of Ben Franklin looks younger than the real bills, the chamber said.

The chamber said swiping bills with an alcohol wipe sheet may remove or smudge the color.