On Tue, 21 Jun 2005, Barry Watzman wrote:
The discoloration is caused by UV light exposure
And exposure from Sun. I have many items that are discolored on one side,
where something was exposed to a window.
And cigarette smoke. I've "fixed" several "dim" terminals
with the liberal use of 409 (a cleaner). It's amazing how thick
the gunk can get.