machinecoder wrote:Have you ever considered that Oxygen may be the cause ? could it be a process of oxidation (interaction between oxygen molecules and other substances)
SpidersWeb wrote:I liked the idea of a clear acrylic in the other thread - would have to experiment with that though - wouldn't want to change the appearance or make them super glossy.
matsondawson wrote:When you retrobrite does it leave behind any contaminants in the plastic that may react with oxygen also?
matsondawson wrote:Also the retrobrite website mentions migration of the bromine to the surface, so maybe what you are seeing is untreated and unseen bromine migrating to the surface.
tezza wrote:matsondawson wrote:Also the retrobrite website mentions migration of the bromine to the surface, so maybe what you are seeing is untreated and unseen bromine migrating to the surface.
I'm sure that's what we are seeing. My surprise was that this was happening under very low UV/light exposure.
matsondawson wrote:No, I mean the bromines are already broken down inside the case from previous exposure and not visible as they haven't migrated to the surface yet.
The migration wouldn't require UV light. That would explain why it happens in previously affected places.
If that is true then it seems retrobrite could never work for long periods.
Maybe someone could crack a retrobrited case in half for a cross section and have a look with a microscope.
Carcenomy wrote:Some of these cases have taken decades to yellow, my question is if yours have yellowed like this in four years in darkness, how much more would they have yellowed in a normally lit room? Is it a constant level of yellowing regardless of exposure?
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