"Yellowed" Spice Keys (originally light beige)


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?


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...


Laundry Bleach will sometimes whiten a bit. Wonder if the new stuff for teeth has any affect. Try both at your own risk!


It is UV aging. There are additives for plastics used to help reduce aging and UV acceleration tests to help evaluate.



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") ?


Possibly Related Threads…
Thread Author Replies Views Last Post
  Light spectrum on HP Prime Mic 2 1,241 09-19-2013, 12:47 AM
Last Post: Mic
  CLASSIC/SPICE KEY LEGENDS Mike T. 2 1,411 08-21-2013, 04:53 PM
Last Post: Mike T.
  HP Spice Legacy in the former CCCP (MK-61) Mike Morrow 17 4,599 04-07-2013, 08:25 PM
Last Post: db (martinez, ca.)
  Calculators usable in dim light Marcel Samek 10 2,836 03-09-2013, 01:08 PM
Last Post: Eddie W. Shore
  Working around broken Spice battery connections Les Wright 7 2,620 06-06-2012, 06:50 PM
Last Post: Mike T.
  Woodstock/Spice Keyboard Cleaning Revisited Matt Agajanian 0 1,047 05-12-2012, 03:43 PM
Last Post: Matt Agajanian
  Keyboard Cleanup for a Spice (or any other HP) Matt Agajanian 7 2,182 05-03-2012, 07:50 AM
Last Post: Matt Agajanian
  Spice repair - dilemma & opinions, please McAllan 1 1,081 02-09-2012, 03:41 PM
Last Post: McAllan
  Trying to understand Spice ROM/RAM Layout Michael de Estrada 4 1,581 06-17-2011, 08:43 PM
Last Post: Michael de Estrada
  Repairing a cracked Spice case Jeff Kearns 3 1,520 04-20-2011, 07:27 PM
Last Post: Jose Poyan

Forum Jump: