iHOP - UVA protection efficacy of sunscreens can be determined by the persistent pigment darkening (PPD) method. ( Part 2).

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Moyal D, Chardon A, Kollias N L'Oréal Research, Clichy, France.
Photodermatology, photoimmunology & photomedicine. (2000)
PMID: 11132127		Fulltext - Related articles - Download citation