Police are hoping to literally catch two robbers red handed after security dye exploded on to their palms as they opened a bundle of stolen notes.
The two men, one black and the other white, went into Unwins in Preston Road, Brighton, and threatened a cashier with a knife.
They grabbed money from the till and fled. The cashier, in his early 20s, suffered shock but was otherwise unhurt.
Detective Sergeant Phil Herring, of Brighton and Hove CID, said: "The offenders ran off with a security device that sprays a red liquid.
"They should be covered in the indelible stain so we are appealing to anyone seeing these two men to come forward."
The robbery happened on Friday at 8.25pm and anyone with information should contact Mr Herring on 0845 6070999.
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