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Originally Posted by PeterM
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No it's not collodion but a similar process to the one described ,but using a modern polymer sprayed on and peeled off. It's been used on the individual mirrors from the Keck telescope. Its described in the youtube video below. I believe the company is called Photonics.
Look on YouTube for "cleaning aluminium mirror with first contact polymer at vandenberg"
I did see it described and demonstrated at an astronomical products so some years ago in America.
Philip
Ps couldn't copy the link that's why I gave the video title.