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SelectaADN spray, with ultraviolet indicator, is being used by McDonald's, a world-famous fast food chain, to improve safety.

Mc Donald is testing a new security system across Australia - the SelectaADN spray. This is one of the efforts to reduce the number of robberies occurring at the company's fast-food chain.

Sprays contain ultraviolet indicator, invisible to the naked eye.

SelectaADN is a spray that contains a solution of ultraviolet indicator. This solution is 'invisible' to the naked eye but will show if the ultraviolet light is on. In a solution containing a DNA code in particular, makes it easier to 'bust' was sprayed SelectaADN offenders in person.

'This is an effective precautionary measure. Since using SelectaADN, there are not any robberies happening in the shop, '' McDonald's spokeswoman said.

McDonald's spokeswoman said the company would expand its use of SelectaADN sprays at its stores across Australia.

In addition to the use of aerosols, McDonald's has implemented other security measures, such as strengthening the practice, tightening payments, using cameras and resorting to the help of local police.