the paint is invisible in daylight , but in the dark it reflects light in the same direction as the light source to illuminate the objects it has been sprayed on .
dispensed in a spray can , the paint can be washed off , so it can also be applied to clothes , helmets , pushchairs , dog leads and obviously , bikes .
a trial began in london bike shops on 2 april to gauge public interest and 2,000 cans were given away free as word of the popular product spread .