Hey guys I create a product that uses full sheets of black anodized aluminum, but I am having trouble getting a nice white engraving like I do with other anodized products. Are there certain anodization process's that are better for a C02 laser in terms of getting a better contrast? I have tried just about every setting, but I'm at the point where I think it might be the metal I have. I go through a local large metal supplier, and I don't think the aluminum is "dipped" as only one side is anodized. Any ideas, and or recommendations on metal suppliers that I could order quality anodized alum from in bulk?