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To re-anodise you first have to remove the original anodising to get back to the aluminium surface, as the anodised finish in an electrical insulator, but the surface has to be conductive during the process.
As Mark says, soft anno can be readily coloured, and a good job can be a beautiful thing! Hard anno can pretty much be clear or a greenish-browny colour. There's also a method of hard anodising called 'hardcoat'. Hardcoat can be coloured a very nice even black colour. Unfortunately, not many anodisers can actually do a proper hardcoat job.
Cheers,
Jason.
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