There are two different tipe of black chrome color from the chrome plating process, there are trivalen chrome plating process and hexavalent chrome plating process. Through trivalent chrome plating just can result semi black dark color, but this product have advantage of more stand to corrode. See black and color chromium deposit.
Hexavalent chrome or Cr (IV) plating process can result true dark deposit color, very dark, smooth and non reflective. Hexavalent chrome is not good for goods that purpose to stand in corrosive environment because the layer is not strong enough stick to the surface layer.
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