Assertion: chemical sunscreen | /r/HasProperty | exposed to sunlight
Facets:
Source sentences:
text: Chemical sunscreens begin degrading once they are exposed to sunlight and are effective for 2 hours of sun exposure.
text: Chemical sunscreens begin degrading when exposed to sunlight and last only 2 hours in the sun.
text: In the later 1990s, University of Oxford researcher Dr. John Knowland reported on studies that showed when the chemical sunscreen was exposed to sunlight, it broke down, releasing free radicals that could damage DNA.