De-yellowing results

Chuck Guzis cclist at
Mon Aug 31 23:30:15 CDT 2015

On 08/31/2015 09:10 PM, Jay Jaeger wrote:

> My VT100 is most yellow on the side facing the window, which for
> years had ordinary glass.  It is less yellow front and back, and
> almost no yellow on the side away from the window.  Same with its
> keyboard.
> So, in at least some cases, it does seem to be related to how much
> light that falls on the surface.

Yup.  I pulled a ITT clone of a AT&T 2500 series desk set phone from the 
storage cabinet.  You know, the usual made-to-last 50 years iconic 
phone.  It was a light brownish-beige after I picked it up cheap back in 
the 1980s.  It has never been used, much less seen the light of day.

Today, the beige has developed an ugly yellow cast--and it's uniform 
over the entire phone.  The material, as I seem to recall, is ABS (Cycolac).

Oddly, the WE-made same-color phones that I have and are out in the open 
(and the same color) don't show this discoloration.


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