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photochromic lens is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation
Finger of girl point to her elbow because dark patches on the skin and allergic rash known as acanthosis nigricans look like a darkened velvet.
Grungy textured blank surface abstract grey background. Dirty poster wallpaper with rough grained stone pattern and vignette darkened edges
closeup woman having a problem with neck wrinkles, dark skin, aging process concept
Two hands in protective black rubber gloves covering vehicle headlight with film to darken them. Closeup indoor shot. Car detailing. High quality photo

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Storm clouds in summer: Ragged wind-driven dark clouds move in quickly to obscure large white billows before sunset, for meteorological themes of instability and rapid changeImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/storm-clouds-summer-ragged-winddriven-dark-298190213">Image used under license from Freestock.com</a>
Storm cloud blocking sun high in the sky, mid day, black and whiteImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/storm-cloud-blocking-sun-high-sky-3437921">Image used under license from Freestock.com</a>
Clouds in a blue skyImage used under license from Freestock.com<a href="https://www.freestock.com/free-photos/clouds-blue-sky-585162">Image used under license from Freestock.com</a>

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