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Well, the ones with the "crispy" surface of salt residuals most probably. However, the different staining in the almost pristine contition (... those without any corrosion marks) are somehow surprising - no? Some have brown brass type tinge, others grey or silver shiny.... - or is it just...

Hi folks, i was following the discussion very briefly, but sometimes was a bit surprised about old/used aluminium screws being almost pristine and others with a quite creepy shine. I´m wondering if there are probably different grades of aluminium screws available?