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karthikaqpt writes:

Engineers at MIT and Penn State University have found that under the right conditions, ordinary clear water droplets on a transparent surface can produce brilliant colors, without the addition of inks or dyes. The researchers have developed a model that predicts the color a droplet will produce, given specific structural and optical conditions. The model could be used as a design guide to produce, for example, droplet-based litmus tests, or color-changing powders and inks in makeup products.

https://www.rtoz.org/2019/02/28/engineers-make-water-droplets-produce-iridescent-colors/ [rtoz.org]

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