Apply a small amount of powder to both hands. Thoroughly wash hands, turn off the lights and place the UV light over the hands. The 'germs' are easily detected under the UV light, illuminating those areas not properly washed.
To demonstrate cross contamination sprinkle the powder onto hands, fake a sneeze and shake hands with several people. Dim the lights and place the UV light over the the hands and face to reveal how easily germs are spread.
To demonstrate surface cleaning, dust a small amount of powder onto a surface. Clean the surface and then pass the UV light over the area.
112gm bottle, 150-200 demonstrations