A chat with a museum conservator about old lens haze

I was fixing a 1950s rangefinder and mentioned the haze looked permanent, but she said they often clean it with a 50/50 mix of hydrogen peroxide and ammonia under UV light. That trick saved a lens I thought was junk. Has anyone else tried this method on vintage glass?

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amy_murphy155mo ago

That 50/50 mix with UV light is interesting, but doesn't the hydrogen peroxide risk bleaching any coating on the glass? I'd be worried about damaging the optics long-term.

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val_chen165mo ago

Actually @amy_murphy15, I used to worry about that too until I saw test results that changed my mind.

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