Miata Mailing List: June 1995, Message #1531
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   From: a.mccombs3@genie.geis.com
Subject: Re: Back Window turning brown?
   Date: Thu, 29 Jun 1995 20:53:48 -0400

It appears that Steve Cobb has hit upon the window browning process.  Any
localized extreme heating (e. g., water droplets acting as lenses and
focusing the sun's rays locally) appears to cook the plastic, and discolor
it.  The (even slightly) discolored plastic tends to absorb more heat than
clear plastic, which makes it turn a bit browner ... etc.  Along with the
browning, the plastic becomes more brittle in those locations.  So:  I
wonder if UV really has much to do with it?  I'm still gonna get that glass
rear window one of these days -
                                                --Jack M. & KANSEI--