PINCH WELD COLOR

I was on another site & they were talking about what colors that the pinch welds were. Now i have been doing restoration work for some time. A B E bodys barracudas, challengers, gtxs, darts, dusters, just to name a few. I have never found any of them with different colored pinch welds other than body color. The only ones i have done were a challenger t/a & a aar cuda that had the pinch welds black. Other than the T/As & AARs has anyone seen the pinch welds a different color other than body color from the factory ?