Re: keybaord graphics fading? Message #3 Posted by Dave Shaffer on 26 Feb 2006, 5:17 p.m., in response to message #1 by Hal
I just dragged out my 30+ year old HP35, and the keyboard looks just fine to me. During its youth, this calculator was left on my desktop all the time, exposed to whatever light was around. It has spent most of the last 15 years or so in a desk drawer, however. My HP11C and HP41CV which I have owned since they were new (and early in the life cycle of these products) also look pretty good to me, and they've not been babied with respect to light exposure.
The usual culprit for fading is ultraviolet light (UV), the photons of which have the highest energy and are most likely to interact with the pigments. Even a simple pane of glass absorbs most UV radiation. I suspect your keyboards behind glass are OK.
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