 | | Re: why parts yellow (was Re: Sopwith Camel pictures)
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| (...) According to our resident plastics expert at work, both ABS and CA (cellulose acetate) polymers will discolour from exposure to ultra-violet light. The UV energy directly "attacks" the molecular bonds of the polymers. And presumably this (...) (24 years ago, 30-May-01, to lugnet.general)
| | | | | Re: why parts yellow (was Re: Sopwith Camel pictures)
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| Recently I was checking some of my Classic Lego windows & doors for yellowing. The older ABS white windows (from 1964-72) were quite prone to yellowing. However, ALL of my Cellulose Acetate white windows had sustained NO yellowing (I have hundreds (...) (24 years ago, 31-May-01, to lugnet.general)
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