Case yellowing - interesting read


(to sum it up: you can slow the yellowing, but once it's there, you can't do anything against it...)


Thanks for that pointer, right up my alley! HP mostly used dark plastics for their old calculators, but yellowing is often a problem on the Woodstock and Topcat cases. It's a bigger problem on the 9815 case, the plastic seems really "cheap" and is very light in color.

I like the sidebar on the Magic Erasers, I need to give them a try when cleaning old calculators. I usually use Novus #1 plastic cleaner along with 99+% isopropanol to get off the really nasty stuff like ink stains.

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