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Developed in Japan, the PA rating system was adapted from the Persistent Pigment Darkening (PPD) method. This test uses UVA radiation to cause a persistent darkening—tanning—of the skin to determine how long it takes for the skin to tan.
In theory, a sunscreen with a PPD rating of 10 should allow an individual to handle 10 times as much UVA exposure. If a product’s PPD = 8 to 16, PA = PA+++
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