Blue/Talk

Why is water blue? --AxelBoldt

Because of the tail of an absorption at around 750 nm absorbs the red. The absorption is an overtone of the O-H stretching vibration.

Interestingly, heavy water (D2O) is colourless, because the absorption band is at a longer wavelength (~950 nm). -- DrBob

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"In German, "blue" means "drunk"."

Is it possible that this is connected to the origin of the term "blue laws"? I read something on encyclopedia.com about "blue paper they were written on," but that assertion seems asinine at best. A linguistic connection to German immegrants just feels more probable.--BlackGriffen

What are "blue laws"? Maybe they should be mentioned on the main article as well. --AxelBoldt

Good point. "Morals laws" governing alcohol, gambling, sexually-related materials, etc.

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"the term most likely derived from an eighteenth-century usage of the word "blue" as a disparaging reference to something perceived as "rigidly moral" (a "bluenose," for example, is one who advocates a rigorous moral code"

http://www.snopes.com/language/colors/bluelaws.htm

Food for thought, --Alan D

Another example of that would be blue blood. I have to wonder about the etymology of the phrases, though.--BlackGriffen