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From: Brian Skiff (bas_at_hidden_email_address.net)
Date: 05/17/1995


     Circumhorizontal arcs are ordinarily strongly colored, so evidently chemical impurities are not _necessary_ for strong coloration, but it may be reasonable that they could cause it.

     It seems like many of us could do with some hard facts on this subject
from the literature. Can someone with access to the right journals provide a summary for us?
\Brian