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).=