It is also the color of F-centers (electron holes) in crystals such as 
Fluorite CaF2 

-----Original Message-----
From: CCP4 bulletin board [mailto:ccp...@jiscmail.ac.uk] On Behalf Of
William G. Scott
Sent: Friday, November 13, 2009 1:47 PM
To: CCP4BB@JISCMAIL.AC.UK
Subject: Re: [ccp4bb] video that explains, very simply, what Structural
Molecular Biology is about

On Nov 11, 2009, at 1:44 AM, Vellieux Frederic wrote:

> but also shows what we crystallographers have known for a long time, since
the first colour E&S graphics workstations in fact, that the electron are
blue

That is the color of electrons dissolved in liquid ammonia (thus allowing
the viewer to relate it to their normal every-day experience).=

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