[click on image to see a larger one]
BW human vision VIS image (left), bw UV image (right)
So, the sunblocker in my daycream obviously has protective effects, clearly visible by the darkened skin. This shows that the used cream absorbs dangerous UV-B and also UV-A radiation (the latter being important to protect against the so called "white" skin cancer). Further its gets visible, that the reflected UV image clearly shows otherwise invisible freckles, about which some dermatologists say that it is skin damage getting visible, caused by the accumulated UV radiation exposure over the years. So whenever you're out in the sun, protect your skin!
To summarize, I would say that reflected UV photography is a very suitable tool to make all that so nicely visible!
I have written about that HERE before.
There is also a corresponding video about that topic HERE
Stay tuned, more will follow on that fascinating subject...
More info on this very interesting field may be found on my site http://www.pbase.com/kds315/uv_photos