Using color charts downloaded from the web

[Ron Duke]

I try to pride myself in being accurate in regards to my renderings of vehicles. Not just the emblems and other details, but also the stock colors offered by the manufacturers for the vehicles originally.
The only source I could come up with was googling color charts posted on the web by researchers, fanatics and other sources.

My question, though, is there any possible way I can obtain/achieve the actual color for my projects? I've noticed, by chance, that some of the color charts, after downloading them, don't aren't rendered spot on, i.e. I just tested my Nova SS in what the chart said was Tuxedo Black, but it showed almost like a dark maroon.

I'm guessing there is no perfect way of doing this, but I've been wrong on most of my guesses. So, I'm hoping someone out there has a solution.

ron