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Thanks Raymo, I'll check it out. If I could get some nitric acid I would be able to recycle the silver coating and it would cost virtually nothing to resilver the mirror. The two chemicals I can't get are nitric acid and amonium (nitrate or concentrated liquid) in non comercial quantities. Apparently they are bomb making ingredients. I have been able to improvise but maybe the impure chemicals are affecting the process. But for the moment it's working and has not cost much to ressurect the scope.
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