The man entered Ulster Bank in Blackpool on Cork city’s northside at approximately 11.30am yesterday and threatened staff with a knife.
Staff at the bank handed the raider a cash bundle loaded with a special security dye, which exploded as the thief left the bank — covering him and the notes in a purple dye.
It is believed the man has the ink on his hands, clothing, and the cash he stole, as a result of his setting off the security feature when he left the bank.
The man is described as being approximately 6ft tall and of strong build. He was wearing grey pants, a dark hooded sweatshirt and a grey baseball cap at the time of the robbery, and fled the scene on foot.
He left the bank, which is on the Old Mallow Road by Blackpool Shopping Centre, and headed in the direction of Spring Lane.
A number of road blocks were put in place in the area in an attempt to thwart the raider’s escape.
No one was injured in the incident, though staff at the bank were said to be shocked at what had happened.
Gardaí analysed the scene in the aftermath of the robbery and are examining CCTV footage of the incident in an attempt to identify the culprit.
Anyone who comes into contact with cash covered in a purple dye, or anyone with information on the robbery, has been asked to contact gardaí at Mayfield on 021-4558510 or the Garda Confidential Line on 1800 666 111.