Unpigmented (ie Class 1) hard coat anodizing will change the color of the aluminum depending on the specific alloy and anodic thickness. The color of aluminum after hard-coat anodizing depends on the alloy and the thickness of the coating. Many 6xxx series aluminum will be a dark grayish black, while most 7xxx and 2xxx series will be a more gunmetal gray color. With some alloys, the color of the aluminum after hard coat anodizing will be grey/bronze. For pigmented Type 2 coatings, black is by far the most commonly specified and will give a very pleasing, even appearance. Other colors will have an uneven finish and appearance due to the inherently dark nature of the unpigmented coating. If you need a color other than black, you need to sample before production.
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