 | | Re: Cleaning old Lego
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| (...) 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. (...) (20 years ago, 24-Jan-04, to lugnet.general)
| | | | | 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)
| | | | | Re: Cleaning old Lego
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| (...) It's entirely possible. I've noticed that there are two distinct versions of the old classic brown when produced in ABS (just the harder plastic used for 2x4 bricks, not the softer plastics), but they only really show up under blacklight. (...) (20 years ago, 26-Jan-04, to lugnet.general)
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