"Copper forms a rich variety of compounds with oxidation states +1 and +2, which are often called cuprous and cupric, respectively.[8] It does not react with water, but it slowly reacts with atmospheric oxygen forming a layer of brown-black copper oxide. In contrast to the oxidation of iron by wet air, this oxide layer stops the further, bulk corrosion. A green layer of verdigris (copper carbonate) can often be seen on old copper constructions, such as the Statue of Liberty, the largest copper statue in the world built using repoussé and chasing.[9] Copper tarnishes when exposed tohydrogen sulfides and other sulfides, which react with it to form various copper sulfides on the surface.[10] Oxygen-containing ammonia solutions give water-soluble complexes with copper, as do oxygen and hydrochloric acid to form copper chlorides and acidified hydrogen peroxide to form copper(II) salts. Copper(II) chloride and coppercomproportionate to form copper(I) chloride.[11]" Wikipedia
If the oxidation is really bad you can add some table salt. The salt helps by adding some grit to the ketchup. Thus making the ketchup more abrasive. That's right your 57 #Heinz ketchup is not just for french fries and burgers anymore it is also a cleaning agent.
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