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Surely caustic soda will dissolve the aluminium not oxidise the surface.
I am sure it will make cases quite bright but it will strip the oxide layer and then leave them prone to corrosion.
Anodising usually uses sulphuric acid as an electrolyte and then a dye to change the colour as thin films of aluminium oxide are quite transparent.
After using a dye it is normal practice to seal the surface to prevent any colour leaching.
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