Abstract: A surface treatment process for coloring metal articles includes following steps. In a first step, a metal article is anodized to form a first anodic oxide layer including a first portion and a second portion on the original metal article. In a second step, the anodized metal article is dyed. In a third step, the first portion of the first anodic oxide layer is removed from the anodized metal article to partially expose a metal body of the anodized metal article. In a fourth step, the exposed metal body of the anodized metal article is anodized to form a second anodic oxide layer. In a fifth step, the exposed metal body of the metal article is dyed.