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Why ARE the sparks blue / purple (fwd)

---------- Forwarded message ----------
Date: Sun, 28 Oct 2007 18:34:42 +0000
From: James Howells <james@xxxxxxxxxxxxxxxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Why ARE the sparks blue / purple

At Saturday's CAMBRIDGE ( UK) TESLATHON  I was asked by a visitor why 
are the sparks blue /purple
and I did not know !
I assumed it was because ozone resonates at that optical  wave length 
but I do not know for sure ..... answers please.

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