Short story, the other night I was working on the 70 car (Black Cherry) and my air hose came apart turning it into a fire hose type deal with a metal end thrashing around all over the place, by the time I caught it, the damage was already done to the car, so now, off to the paint shop to have 2 nasty dents and chunks fixed, I wasnt worried to much because I had the label from the PPG can from when it was painted, knowing trying to match this paint was going to almost impossible from scratch,, so now the dents are fixed all sanded down and painted, when we pulled it out of the booth and into the sun, it wasnt even close to the same color,, so now we call in the "expert" with the color gun, he shoots it,, well this time we use test sheets to confirm the color,, we do this 3 times color is never correct,, now Im bumbed out,,, so we call the PPG wizards and they send down there head wizard, old guy like me,, aske "when was the car painted"? I told him it had been a few years back, he siad ok and left, came back in 45 minutes handed the painter a pint of paint with the original code I had on my label,, and told him to do a sample sheet with this,, low and behold, perfect match,, moral to the story,, I learned that these paint companys change there mixture process every once in awhile, and if you dont use the era correct one, the paint color probly wont even be close,, thanks to the "old" guy @ PPG, we now are all one color and dentless again,, see us old guys are worth keepin around