Aluminum oxidation of the border should be uniform, in the same component color uniform; scratching/knocking the border wounded/injured outside a meter at any angle not visible
Oxidized aluminum frame should be uniform, uniform color on the same assembly; border-scratch / knock hurt / injured one meter is not visible at any angle
Oxidation in the aluminum profile frame should be uniform, in the same component uniform color, border scratch / knock hurt / injured one metre away from any angle is not visible