One of the measures of water quality, or pollution levels in water, is its color; How is this color measured? The scale for such color measurement for water quality is Platinum-Cobalt (Pt/Co) scale or alpha-Hazen scale introduced by Allen Hazen, a chemist in 1892. This scale measured how yellow tinted water samples are. One Pt/Co unit is how much 1 milligram of Pt/Co taints/colors 1 liter of water! How they measure it is another story, and apparently there are standard tests defined for this purpose.
Reference:
https://en.wikipedia.org/wiki/Pt/Co_scale
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