Color of water

a glass of transparent water sitting on a wooden table
When water is in small quantities (e.g. in a glass) it appears colorless to the human eye.

The color of water varies with the ambient conditions in which that water is present. While relatively small quantities of water appear to be colorless, pure water has a slight blue color that becomes deeper as the thickness of the observed sample increases. The hue of water is an intrinsic property and is caused by selective absorption and scattering of blue light. Dissolved elements or suspended impurities may give water a different color.


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