9 Dec
2013
9 Dec
'13
8:28 p.m.
On 12/09/2013 05:23 PM, Fred Cisin wrote:
Over time, the deterioration and chemical reaction is
getting deeper and
deeper. Treating the surface will only be temprorary unless you find a
way to reverse entropy to the depth that it had occurred.
Maybe yellow is the permanent natural color, and white/beige was just
temporary, to begin with?
I stumbled across some old nightlights that use the small C7 (7 watt)
bulbs. The clear acrylic shades are discolored yellow in the vicinity
of the lamp filament. I'm pretty sure that this isn't due to thermal
effects, as there's no distortion of the plastic. Viewed edge-on, it's
quite clear that the yellowing is most intense on the surface but does
extend through the top millimeter or so. I'd be surprised if any
chemical water-based agent could affect anything but the surface.
That may have something to do with the lack of permanence of the
Retr0bright treatment.
Just thinking aloud,
Chuck