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White anodization is reportedly even worse than painting - different pigments adhere differently to the porous aluminium surface, and different sized parts need different treatment times to gain the same saturation based on their surface area, the chemicals used, the pigment, the voltage applied, and a host of other factors, so all anodization color matching is tricky, but white is supposedly the worst there too. And matching white anodized aluminium with anything painted? Might as well give up.
