 | | why parts yellow (was Re: Sopwith Camel pictures) —Cary Clark
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| | | Frank Filz showed me a brick out of a sealed set from the 70's that had yellowed in the box, once opened over twenty years later. The box may have been near or in a store window, so it may have gotten UV through the box, but the parts in the same (...) (23 years ago, 30-May-01, to lugnet.general)
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| | | | | Re: why parts yellow (was Re: Sopwith Camel pictures) —Tony Priestman
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| | | | | On Wed, 30 May 2001, Cary Clark (<GE5u0s.MLF@lugnet.com>) wrote at 18:00:14 (...) It is distinctly possible that there is more than one cause of yellowing, as there appears to be more than type of yellowing. Having said that, the following (...) (23 years ago, 30-May-01, to lugnet.general)
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| | | | | | | Re: why parts yellow (was Re: Sopwith Camel pictures) —Dave Schuler
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| | | | | | | (...) I don't know nuthin bout no free radicals, but my grandfather has had white vinyl siding on his house for about fifteen years, and its still a lot whiter than my white LEGO bricks purchased at about the same time (and which have spent a lot (...) (23 years ago, 30-May-01, to lugnet.general)
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| | | | | | | | | Re: why parts yellow (was Re: Sopwith Camel pictures) —Tony Priestman
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| | | | | | | | On Wed, 30 May 2001, Dave Schuler (<GE62DC.J0D@lugnet.com>) wrote at 21:00:48 (...) uPVC for outdoor use in windows, etc. is absolutely brimming with the stuff that stops it going yellow & decomposing. Because LEGO isn't designed for outdoor use, it (...) (23 years ago, 30-May-01, to lugnet.general)
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| | | | | | | Re: why parts yellow (was Re: Sopwith Camel pictures) —Duane Hess
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| | | | | | (...) <SNIP> (...) Darn revolutionary extremists! I wish they would leave politics out of this. :-) -Duane (23 years ago, 30-May-01, to lugnet.general)
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| | | | | | | | Re: why parts yellow (was Re: Sopwith Camel pictures) —James Brown
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| | | | | | (...) Just get yourself some free radical traps. Work like a charm for us, and we didn't even have to pay shipping. <grin> (wait for it...) It really is pretty elementary. <duck & run> James (23 years ago, 30-May-01, to lugnet.off-topic.pun)
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| | | | | Re: why parts yellow (was Re: Sopwith Camel pictures) —Kyle D. Jackson
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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 (...) (23 years ago, 30-May-01, to lugnet.general)
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| | | | | | Re: why parts yellow (was Re: Sopwith Camel pictures) —Gary Istok
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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 (...) (23 years ago, 31-May-01, to lugnet.general)
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