Engineers 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.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/02/190227131833.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/02/190227131833.htm
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