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Post by getterjehuty on Oct 2, 2020 12:36:37 GMT -5
I have heard chogokins or plastic mechas’ plastic turning yellow when stored inside the original box without exposure of sunlight. Is this true? How can thsi happen and how can you prevent it?
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Post by admin1 aka Ed on Oct 2, 2020 12:53:47 GMT -5
Mine do from the 80's and 70's. My buddy told me that there were "photo stabilizers" that weren't added to plastic then. Light turns them yellow then. I've also had personal experience in yellowing if you keep plastic above 100F in storage. Florida is bad about that Ed
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Post by mpchi on Oct 2, 2020 15:00:19 GMT -5
Some of mine gets yellowing in dark cabinets with little to no sunlight contact (unless I open them and check out my toys). From Takatoku/Bandai Macross stuff from the 80s, to Yamato's Macross stuff in 2000s, and even the somewhat more recent Bandai DX Frontier stuff. All have different degrees of yellowing, mostly occurred on white unpainted plastic, or something light like a light grey or light green (Takatoku Orguss). But I don't have anything turned yellow inside the box personally.
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Post by getterjehuty on Oct 2, 2020 15:00:35 GMT -5
Mine do from the 80's and 70's. My buddy told me that there were "photo stabilizers" that weren't added to plastic then. Light turns them yellow then. I've also had personal experience in yellowing if you keep plastic above 100F in storage. Florida is bad about that Ed But what about the current SOC line or the metal builds? I have numerous that are stored in the box and I live in SoCal (it is hot).
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Post by mpchi on Oct 2, 2020 15:02:54 GMT -5
Mine do from the 80's and 70's. My buddy told me that there were "photo stabilizers" that weren't added to plastic then. Light turns them yellow then. I've also had personal experience in yellowing if you keep plastic above 100F in storage. Florida is bad about that Ed But what about the current SOC line or the metal builds? I have numerous that are stored in the box and I live in SoCal (it is hot). White and light color plastics (unpainted) are very prone to yellowing, and Metal Build is not an exception. But if yours has been living in the coffin this whole time, then I am not sure.
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Post by getterjehuty on Oct 2, 2020 15:08:33 GMT -5
But what about the current SOC line or the metal builds? I have numerous that are stored in the box and I live in SoCal (it is hot). White and light color plastics (unpainted) are very prone to yellowing, and Metal Build is not an exception. But if yours has been living in the coffin this whole time, then I am not sure. yeah, I am concerned on the boxed ones. most of my collection I keep inside the closet or something and I only expose them to sunlight for quick picture taking. And do plastic store UV light/sunlight even when you keep it inside the box/out of light?
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Post by Gold on Oct 29, 2020 2:08:44 GMT -5
White and light color plastics (unpainted) are very prone to yellowing, and Metal Build is not an exception. But if yours has been living in the coffin this whole time, then I am not sure. yeah, I am concerned on the boxed ones. most of my collection I keep inside the closet or something and I only expose them to sunlight for quick picture taking. And do plastic store UV light/sunlight even when you keep it inside the box/out of light? If I understand your question correctly, you mean if they item has been exposed to UV sunlight and then stored, will it continue to degrade? To answer the question , if it was exposed only shorty, like for photo sessions, then I don't think it does. I think it's more about long term exposure to light that yellows plastics, if we're talking about light. That said, personally, I always consider humidity to be the greatest factor in causing stored items to yellow and then, temperature, last. I have a few items in storage at my brother-in-law's warehouse and the room can get hot in the summer (34-36C), but fortunately so far nothing has yellowed, not even the acetate windows on my packagings from various Transformer lines from 10 years back. The trick was to toss as much Silica Gel into each storage box (I use heavy duty cardboard 20 cubic boxes so it "breathes" compared to plastic bins, just watch out for termites), and then keep the room dry by going crazy with dehumidifiers (I use 6-8 disposable 800ml canisters in a sqm area of about 30). Been doing that for the better part of a decade, no issues. Hope this helps Gold
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