Brush the surface of the impression with the powder using a soft brush. The powder will change the surface of the impression, allowing it to be photographed with much better contrast and recovering valuable details. This technique works best on wet melting snow but also on cold frozen snow.
Only to be used outdoors. Use proper personal protective equipment. Do not allow water to get into the container, keep container tightly closed. Keep away from sources of ignition. Store in a cool, dry well-ventilated area away from incompatible substances.