Subject:
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Re: Cleaning old Lego
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Newsgroups:
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lugnet.general
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Date:
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Sat, 24 Jan 2004 19:09:20 GMT
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Viewed:
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3585 times
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In lugnet.general, Jindrich Kubec wrote:
> Has anybody tried to bleach yellowed parts?
Bleach is great for dirt, but yellowing of ABS is caused by a chemical breakdown
of the plastic molecules, not surface dirt. ABS is not UV-stable, and natural
ABS (which has a milky beige color) will turn brown and brittle/powdery over
time. Some coloring agents will lend a touch of UV-stability to the ABS (black
ABS, which is colored with carbon, is 100% UV-stable), but white doesn't appear
to be one of them. The only way to clean the yellow color off is to scrape away
the surface until you get back down to white plastic, and that's not advisable
if you care about the condition of your bricks.
Now, I know cigarette smoke will cause ABS to yellow, but I don't have any
experience with that. It's possible that you can bleach smoke-yellowing out,
but I'd suggest trying it out on one small brick that you don't particularly
value before subjecting large portions of your collection to the process.
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Message has 1 Reply:
 | | Re: Cleaning old Lego
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| (...) Lego has produced different shades of white and I always wondered if they were experimenting with additives. Some of the white bricks are just milkier, less brilliant, out of the box. One commercial product which absorbs UV (mainly for plastic (...) (20 years ago, 26-Jan-04, to lugnet.general)
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Message is in Reply To:
| | Re: Cleaning old Lego
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| (...) I do it as Dan suggested. (in previous mail) But, to add something to your question: Has anybody tried to bleach yellowed parts? (20 years ago, 24-Jan-04, to lugnet.general)
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