A few days ago I accidentally put wife's beloved Bialetti Brikka pot in the dishwasher. The aluminium lost its anodized coating due to chemical reaction with the detergent (alkaline I think), and the pot turned dull/dark gray. Scrubbing the surface left some gray mark on fingers, which got me wonder if aluminium is actually safe for making coffee? Bialetti also sells stainless steel pots, and I wonder if they're safer to use.