If there is a criminal dress code it would have to be all-black attire with matching black balaclava, certainly not purple.
But NSW Police are on the look-out for purple crooks who activated an ink staining system during the theft of an ATM in Sydney earlier today.
Developed by NCR, it is the first time the system has been activated during an ATM theft in Australia although the system has been in place across Europe and the UK for the past five years.
During the incident it appears that the note degradation system was activated. This would have resulted in the banknotes inside the ATM being stained with indelible purple ink.
Police also believe that the people involved may have come into contact with the dye, which is very difficult to remove from clothing as well as the banknotes.
Detectives are warning the public if they come into contact with any notes with purple staining to contact the police.
Police are also appealing for any person with information relating to the offence to contact Crime Stoppers on 1800 333 000.