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While the black anodize covers the whole rotor at first, it will wear off as soon as you drive the car. The only part that will remain black is the "hat". I have EBC rotors that were anodized a light gold. The hats remain light gold to this day and have not rusted. The rotors are nice and shiny from the action of the pads. When the car sits in the rain, the rotor surfaces will rust just like any other rotor and of course, it wears off quickly. Here is a pic of mine after it rained.