ZIMMS Corner Service Station owner Olga Marr is relieved a junior staff member questioned the authenticity of a $50 note being passed to her.

The discovery comes as police investigate three separate instances in the past fortnight where counterfeit currency had been used to pay for goods and services in the Toowoomba area.

Ms Marr said a man tried to pay for a drink with a $50 note about 5.30pm on August 18.

She said her 16-year-old female staff member was the only other person in the Warrego Hwy store at the time.

"She (staff member) said to me it looked like the colours were different," Ms Marr said.

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"Obviously, the girl had enough guts to turn around to say to him 'no, I'm not taking that'."

Darling Downs district officer Detective Acting Inspector Paul Hart said not everyone had picked up on the fake money before it was too late.

Police believe some of the fakes have been passed by the same man, described as being about 180cm tall, of medium build with a fair complexion and possibly in his mid to late 20s.

"The fake currency has predominantly been $50 notes and business proprietors in particular are being warned to be on the look out for the counterfeit currency which may be passed with other legitimate notes or handed to staff when they are busy and the offender believes staff won't take the time to check the notes," Det. Act. Insp. Hart said.

"Some notes may be in wider circulation, so members of the public are also advised to look carefully at any notes coming into their possession."

Some of the counterfeit currency is of reasonable quality, but has a different texture to regular currency.

Anyone with information can call Crime Stoppers on 1800 333 000 or Toowoomba police on 4631 6300.

Darling Downs district officer Detective Acting Inspector Paul Hart analyses counterfeit cash passed in business transactions in the past fortnight.
Darling Downs district officer Detective Acting Inspector Paul Hart analyses counterfeit cash passed in business transactions in the past fortnight. Stuart Cumming

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