How does sunscreen/spf work?
In: Biology
There are two types of sunscreen: chemical and physical. Physical sunscreen is like paint like u/WRSaunders described. Chemical sunscreen absorbs the energy from light rays. If that energy wasn’t absorbed, it would cause DNA damage and then inflammation, which is the redness and pain you feel when you get a sunburn.
It’s paint. While it seems clear in the colors of light we can see, it’s actually a pigment that absorbs energy from ultraviolet (UV) light. This color of light is what causes sunburns. So, it’s black paint to those burning rays.
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