I'm using my aluminum stockpot as a cleaning vessel for bottles, etc. with oxyclean, and it quickly developed a deep black stain up to the water level, which I'm assuming is aluminum oxide. Is this a problem, or just unsightly?
Lines on Ale
NB Irish Red; 1-gallon SMaSH IPA's: Citra, Cascade, Simcoe, Falconer's Flight and Mosaic; Bavarian Hefeweisen; Centennial Blonde; EdWort's apfelwein
Gone But Not Forgotten:
Blue Schoon (Blue Moon clone)