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

D Moyal1, A Chardon, N Kollias

  • 1L'Oréal Research, Clichy, France.

Photodermatology, Photoimmunology & Photomedicine
|December 29, 2000
PubMed
Abstract

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Pigmentation01:19

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...