Dear Mr./Miss/Mrs Simonii,simonii 寫: For the coating part, i have heard that using chloroform and some plastic can DIY a appreciable solution of coating layer which can protect the silver surface from the polluted air in HK.
But i have forgotten which kind of plastic it is.
Thanks for your concern. However using chloroform to deposit a protective layer may not be uniform enough to secure the necessary optical perfection for an astronomical mirror.
I have searched the webn and it seems that there is no way to form a protective layer over silver by chemical or mechanical means.
Best regards
Chan Yuk Lun