Background: The sun protection factor (SPF) of sunscreens is evaluated using standardized protocols based on the application of 2 mg/cm² of product. However, the amount of product applied by sunscreen users in real life is likely to be much lower.

Objectives: To evaluate a new multispectral imaging approach for determining the actual quantity of sunscreen applied by users and to assess the benefits of an application guide for the use of an SPF 50+ sunscreen.

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