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Old 24th March 2014, 10:46 PM
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Delphinus Delphinus is offline
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Join Date: Nov 2009
Member of: CTC
Location: Portugal
Posts: 476

Caustic soda.

A table spoon of soda per 0,5 dl will do, the warmer the water the better.

If the solution is not very strong you will be able remove the colour without completely remove the oxide of the anodise.
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