Wikipedia: Blue/Talk

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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

"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.

"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

I have always heard that blue laws got their name because they were initially published on blue paper. I think the German derivation is out, unless you know of any Germans who use the literal translation!JHK

There are only "blaue Briefe" (blue letters) in German. Those are unpleasant letters parents get from school. --Vulture

In German, "blue" means "drunk".

: Technical quibble: This is the English-language Wikipedia. German usage is not germane. (Is it really "blau" means drunk, or "blue" means drunk? If the latter, we have a case for including this in English-language Wikipedia.)

"blau" is drunk, not "blue"

: I'm therefore removing the German-language info from Blue

A "Blue movie" is a slang term for a pornographic? film. The term derives from the poor colour balancing (due to cheap production techniques) used in films during the 1970s, resulting in a bluish tone to the skin of the performers.

I think this term goes back at least to the 1920's! OED?

Quoted directly from the OED blue adj:

: " b. Intoxicated. slang (chiefly U.S.).

  1818 M. L. WEEMS Drunkard's Looking Glass (ed. 6) 4 The patient goes by a variety of nicknames..such as boozy

Proposal to end debate:

Put the usage section on another page. How about Color Talk/Blue. Each color can have its own subpage of [Color Talk]?. I bet you're green? with envy that you didn't think of this first. I hope it doesn't make you see red though.