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Re: [ATM] Does exposed Pyrex lose polish over time?
>then maybe a swabbing with conc. nitric acid ( which I
>would repeat 1 or 2x)
This, I will strongly suggest, is to be avoided.
(What will concentrated nitric acid do to swabs is another story.)
This mirror was not exposed to extraordinary contaminants
to require such drastic cleaning methods.
I wander what kind and degree of dirt will require conc. nitric.
Vladimir.
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