I use it when I am out in the sun, and the reason why is based on what I think are three scientific facts - the presence of the radiation, the efficacy of the sunscreen. and the positive outcome from blocking something hazardous.
First, I believe the UV radiation is present on my skin on hot cloudless days even though the rays are absorbed by the atmosphere. I recognise by far most of the sun's natural rays are filtered out, but to me reducing the attenuated radiation still makes a difference.
Secondly, I believe a thin chemical barrier has a significant effect on electromagnetic radiation. I use around 10 ml of 15% active solution, around 1.5 g for my 100 Kg body or 15 ppm. When applied it gives a layer so thin I cannot see it - something like 100th part of a millimeter. Compared to the atmosphere the rays first pass through it is truly negligible - yet I believe this tiny layer works in blocking what kilometers of air let pass.
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