Apparently purple tarnish occurs on gold which has been alloyed with aluminium.
From yournecklace.co.uk - “To remove surface tarnishing of your gold jewellery, you can add a few drops of mild, non-phosphate dishwashing liquid to warm water and wipe the tarnished part with the mixture using your fingers or a cotton swab. Do not use toothpaste or baking soda as they are too abrasive. Dry your jewellery with a soft cotton cloth or allow it to lie flat and air dry completely even if it takes overnight and then once dry, you may polish it with a soft cotton cloth or a jewellery polishing cloth for shine.”
You do not need polish to remove oxidisation. You do need antioxidisation paste. What I do use is a paste that is used as soap with water. Brushed away with old toothbrush. Googling brings several products. In prosess you need to take movement out.
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