The color is officially jet black yes. Now as with all colors there are different shades (thus codes) based on the color scheme palette. BMW will ultimately not disclose which one they use on the 728 wheels but some of the paint suppliers may know. If you have to correct a small imperfection on the wheel, make sure you first test it on the inside part. Probably with a standard jet black you will not see the difference (even if there was one), but safe is safe.
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