IPSWICH police have again warned small business people to watch out for counterfeit $50 notes after fakes were detected at the weekend.

Ipswich CIB Detective Sergeant John Hopkins said notes were passed at small businesses in Brassall, Karana Downs, Blacksoil, Karalee and Goodna.

Sgt Hopkins said yesterday there was a simple but definitive test for anyone to determine if a $50 note was real or fake.

“If you have a look at the plastic insert in the corner of the note, you'll see a 50 inside the plastic and a 50 in reverse,” Sgt Hopkins said.

“If it doesn't have that, it's a fake.”

It is the latest warning police have issued about counterfeit notes in the Ipswich district.

Last month police acting Senior Sergeant Greg Smith said police heard reports of at least 10 counterfeit $50 notes from Springfield to Riverlink.

An Ipswich man was arrested over those counterfeits and is expected to appear in court today.

CIB Detective Sergeant Les Hutton said the man was charged with passing four notes and possessing two more.

“Police also seized equipment that may have been used in the production of counterfeit notes,” Sgt Hutton said.

He said the man was allegedly filmed passing counterfeits at a service station.

Late last month, Gatton police reported two counterfeit $50 notes had been detected in the town.

Sergeant Tom Missingham said two business people in the town identified the notes and they were confirmed fake by police.

Sgt Missingham said the notes were distinguished by the way the plastic window was attached to the note.