Those containing zinc are milky in color, those containing inscriptions are golden to gray in uneven color, and those containing nickel are light yellow. Generally speaking, only aluminum containing magnesium and aluminum containing more than 5% gold contains gold. After oxidation, it can obtain a colorless, transparent and bright appearance. It should be noted that some 5052 aluminum plates have different colors on the surface. These colors are not oxidized, but are formed by anodizing, dyeing or electrolytic coloring. Dyeing can basically come in any color, but electrolytic coloring is relatively rare. It can be done in black, bronze, champagne, golden, and imitation stainless steel.
