When shooting macro at sunrise while the dew is still present, the images have a very special character. But the arrival of the sun and the warming of the atmosphere cause rapid evaporation of the dew. The interval where the light is present together with the dew can be very short.
This time interval will be artificially extended by the use of a "water spray". The fine droplets that it propels attach themselves to the subject and gives the illusion of dew. This method can be used at any time of the day.