"No!" is the short answer.
If you sign up for a free account with the Scottish Register of Tartans mentioned in Sandra Vines' previous answer, you can look up tartans on their website and, in some cases, request, from them, for free, an e-mail with the thread counts (up to five a day), which includes the hexadecimal codes for the colors listed in the thread counts.
It only took me about two minutes to login, request & receive the thread count for the Livingston Tartan, with the following hexadecimal codes:
005020 MOD GREEN"; 101010 "BLACK"; and DC0000 "RED"
You can Google those six-digit codes to find samples of what those colors should look like, subject to the settings on your monitor, the tint of the lenses you're looking through, the shade of the lamp you're using, et cetera.