The reason for that color shift was murky-perhaps for UV protection or camouflage.
颜色变化的原因尚不明朗，也许是为了防紫外线或伪装。
UV protection
原声例句
科学60秒-科学美国人 2020年11月合集
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And in general, most fabrics made with shiny, synthetic, or tightly-woven fibers provide lots of UV protection.
一般来说，大多光滑的合成织物或紧密编织的织物能阻挡大量紫外线。
科普小杂文
While this camera isn't a perfect measure of UV protection, it'll be able to show whether I get an even application or not.
虽然这款相机检测紫外线防护的性能并不完美，但它可以显示我的防晒是否涂抹均匀了。
明星们的购物狂欢
Single mirrored lens and silver tone with 100% UV protection.
单镜面镜片，银色，100% 紫外线防护。
明星们的购物狂欢
Where's the cutoff of UV protection to where you just can't see?
紫外线防护到你看不到的地方在哪里？
英语百科
Ultraviolet
Ultraviolet (UV) light is an electromagnetic radiation with a wavelength from 10 nm (30 PHz) to 380 nm (750 THz), shorter than that of visible light but longer than X-rays. UV radiation is present in sunlight, and also produced by electric arcs and specialized lights such as mercury-vapor lamps, tanning lamps, and black lights. Although lacking the energy to ionize atoms, long-wavelength ultraviolet radiation can cause chemical reactions, and causes many substances to glow or fluoresce. Consequently, biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules.
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