Background Persistent pigment darkening (PPD) is a widely used in vivo method of UVA protection factor (UVAPF) measurement. However, with increased emphasis on UVA protection and sunscreen products with higher UVAPF gaining popularity, the immediate pigment darkening (IPD) method is drawing attention again. Furthermore, only about a quarter of the recommended quantity is used during daily activities. However, there is of yet no clearly defined relationship between the UVAPF and the amount of sunscreen application.
Objectives To analyze the differences between the IPD and PPD methods, and to establish a relationship ...
Immediate Pigment Darkening and Persistent Pigment Darkening as means of measuring the UVA protection factor in vivo: A comparative study is a post from: Skincare
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