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Is there any visual specification for black anodizing color? I heard there are coupons to use as a reference. Is that right? is that comply to Mil-A-8625, Type II, Class 2 requirements? some of black anodizing parts turn to kind of blue. I am wondering is there any standard to specify how off of black could be the color. I went through Mil-A-8625 and QPL-81706 but i couldn't find any thing to address my question.