[paul.fr]

Surely there was a time when the sky was not blue! If so, when did it turn blue, and what colour may it have been before?

[DoctorBeaver]

It wasn't blue when I looked at it last night at 1am  []

[neilep]

cos that's what the colour says in the kit !

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[DoctorBeaver]

[eric l]

This question - or a very similar one - has been asked before on this forum and one "paul.fr" (whoever that may be) answered :  "Rayleigh scattering"
See http://www.thenakedscientists.com/forum/index.php?topic=7909.0
Maybe he also knows when this started.

[DoctorBeaver]

This question - or a very similar one - has been asked before on this forum and one "paul.fr" (whoever that may be) answered :  "Rayleigh scattering"
See http://www.thenakedscientists.com/forum/index.php?topic=7909.0
Maybe he also knows when this started.

[paul.fr]

I know nothing of this imposter. I have the memory span of a goldfish on medication that eats lots of forgetmenots. Now, where was that castle??