Author:  bobnikolov  Posted:  Nov 8, 2021 10:34  Subject:  Re: Yellowing of bricks  Viewed:  38 times  Topic:  LEGO products Cancel Reply

BrickLink ID Card bobnikolov (1879) Location:  Bulgaria, Sofia City Member Since Contact Type Status Apr 6, 2012 Seller Store: BoBricksBg

In LEGO, amvdamian writes:    In LEGO, cosmicray writes:    In LEGO, amvdamian writes:    Why do some bricks (belonging to the same set, from the same bag) turn yellow and others don't? I recently bought an old SW set from ebay (#9500). It looks like the box was damaged from improper storage but the bags were intact. This is an old set and I was actually expecting everything to be somewhat yellowed. When I opened the bags, some bricks of the same shape and color were "yellowed" but others weren't! Given that it was a starship, it almost looks as if the finished model was battle-damaged! LOL It wasn't so much that plastic turns yellow over time that bothers me, but that some apparently do not? I also happen to collect die cast models with plastic parts, and in those cases, all plastic components turn yellow over time. So it baffles me why 3 or 4 of the same brick within the same numbered bag yellowed and others didn't? Is this merely because of uneven (heat?) exposure or because they were from different batches in the factory (and therefore the older ones turned yellow and the newer batches need more time)? Glancing at the large image of 9500, I see no exposed white parts. Are they internal structural bricks ? I've always been of the opinion that UV exposure can cause white and blue bricks to change hue. The other thing that jumps out at me is the issue year of 2012. I am aware that LEGO had different ABS issues during that era (e.g. brittle dk red) so it may well be that the parts in question came from different batches, and the ABS pellets were different. The set itself was unassembled. The individual bags were still sealed but the box is gone even from the previous owner. Just as an example, bag #1 contained two 1x2 inverted bricks. One was yellowed and the other one not. It does not really bug me that all the light bluish gray bricks are yellowed, but that one is and the other one isn't. I could not put yellow components on opposite sides. LOL Here is the key. The box is gone as you said. Probably the bags have been exposed to sun damage without the box for some time or continuously. You didn't know that

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Re: Yellowing of bricks - amvdamian (468)

[...] The set itself was unassembled. The individual bags were still sealed but the box is gone even from the previous owner. Just as an example, bag #1 contained two 1x2 inverted [...] (31 months ago, Nov 7, 2021, to LEGO products)

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Re: Yellowing of bricks - taxan (145)

[...] The flame-retardant material Bromine that LEGO did used for a short time has come to the surface and makes the part yellowed. Bromine is Brown in color. Sunlight or more [...] (31 months ago, Nov 8, 2021, to LEGO products)

8 Messages in this Thread:

 Msg 1 - amvdamian (468) 31 months ago Nov 7, 2021 to LEGO products
 Msg 2 - rylie_aitch (253) 31 months ago Nov 7, 2021 to LEGO products
 Msg 3 - SylvainLS (46) 31 months ago Nov 7, 2021 to LEGO products
 Msg 4 - cosmicray (3495) 31 months ago Nov 7, 2021 to LEGO products
 Msg 5 - amvdamian (468) 31 months ago Nov 7, 2021 to LEGO products
 Msg 6 « - bobnikolov (1879) 31 months ago Nov 8, 2021 to LEGO products
 Msg 7 - taxan (145) 31 months ago Nov 8, 2021 to LEGO products
 Msg 8 - tec (62) 31 months ago Nov 8, 2021 to LEGO products