10 Dec
2013
10 Dec
'13
6:01 a.m.
I suppose it's quite possible that the cleaner used can only affect the molecules at
or very near the surface, and then the molecules (bromide I think?) deeper in migrate up
to the surface in the "cleaned" plastic over time. I am not a chemical engineer
though.
On Dec 9, 2013, at 10:28 PM, Chuck Guzis wrote:
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