HP Forum Archive 08

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"Yellowed" Spice Keys (originally light beige) Message #1 Posted by Luis on 17 July 2002, 1:21 p.m. Some beige keys of the Spice series becomes light "yellowed". I guess it's due to something like smoke on the enviroment where they were (or are) used. Is there some another cause for that? Is it possible to "clean" it?

Re: "Yellowed" Spice Keys (originally light beige) Message #2 Posted by Tony Duell (UK) on 17 July 2002, 6:07 p.m., in response to message #1 by Luis The plastic cases of some DEC terminals and computers (VT100, Rainbow, Pro, etc) also turn yellow. It's generally beleived that sunlight (or other UV light) causes this, and that the effect is not reversable. Or at least nobody has found a satisfactory way of reversing it. This may be related, it may not...

Re: "Yellowed" Spice Keys (originally light beige) Message #3 Posted by Frank on 18 July 2002, 2:22 p.m., in response to message #2 by Tony Duell (UK) Laundry Bleach will sometimes whiten a bit. Wonder if the new stuff for teeth has any affect. Try both at your own risk!

Re: "Yellowed" Spice Keys (originally light beige) Message #4 Posted by Frank on 18 July 2002, 2:20 p.m., in response to message #1 by Luis It is UV aging. There are additives for plastics used to help reduce aging and UV acceleration tests to help evaluate.

Re: "Yellowed" Spice Keys (originally light beige) Message #5 Posted by Andreas Stockburger (EU) on 19 July 2002, 5:29 a.m., in response to message #4 by Frank Hi, several of my calcs has these keys. But why cleaning them ? They are OLD and they are USED. Why should a 90 year old man ("used") looks like a 25 years old ("new in box") ? Andreas

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