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Understanding sunscreen SPF performance using cross‐polarized UVA reflectance photography

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Objective methods for understanding sunscreen behaviour in┬ávitro before they are applied to the skin have failed to keep pace with the ever‐increasing demands for higher SPF scores where the products are absorbing more and more similar levels of UV. A novel method for visualizing the spreading and location of SPF ingredients based on cross‐polarized UVA reflectance photography is described here which gives new insights into the formation of final film morphology and how it correlates with in┬ávivo SPF efficacy for a set of test products.
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Keywords: bioengineering; chemical analysis; claim substantiation; emulsions; formulation/stability; sun protection factor; ultraviolet

Document Type: Research Article

Publication date: April 1, 2018

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