Chemistry & ProductsQuestion 312 of 484
Which pair of active ingredients indicates that a sunscreen is a PHYSICAL (mineral) sunscreen rather than a chemical one?
a.Zinc oxide and titanium dioxide
b.Avobenzone and oxybenzone
c.Octinoxate and octocrylene
d.Homosalate and octisalate
Explanation
Physical (mineral) sunscreens use zinc oxide and/or titanium dioxide to sit on the skin and reflect or scatter UV light. The other ingredients listed are organic UV filters that absorb UV energy and convert it to heat, defining chemical sunscreens.
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