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HP CArd Readers - Longevity
12-03-2017, 01:45 AM
Post: #5
RE: HP CArd Readers - Longevity
(11-29-2017 07:58 PM)Kees Bouw Wrote:  Right now I am having difficulty cleaning the case of a HP-67. On the areas where it has been held there is white tarnish, maybe acid from sweat or skin fat has affected the plastic if such a thing is possible. I have not yet found the right means to get this off.
I would welcome a "plastic historian" to explain these phenomena along with some advice how to treat the various kinds of ancient plastic.

I too am having this white tarnish issue on my 67, it's a real bummer. Any help would be appreciated, I'm afraid to use any commercial products on it.
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HP CArd Readers - Longevity - larthurl - 11-24-2017, 05:35 PM
RE: HP CArd Readers - Longevity - Sukiari - 12-03-2017 01:45 AM



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