Oh poo! I posted this here 2 days ago...but I obviously didn't because it's not here

I guess I didn't hit the button
Anyway, what I was saying about a color "range" is illustrated here-
This is the dreaded WW1 RFC PC-10. No one, and I mean NO ONE can agree on what color it really was. Here are several RGB colors I've gotten, 2 from samples, books and several from the web, mostly from the Aerodrome-

Now I imaging some colors are ones most of us can agree on but what about those that are somewhat of a mystery like PC-10? Would we want to include all versions we've found throughout our research that have validity or choose one or two that we feel personally to be correct? None of us really knows of course, relic samples and war time color samples could have changes over the years and modern restorations could be correct or just as easily be spurious. Perhaps we should be including a bit of research or at least our reason for why we believe one color to be correct over others?
I guess it doesn't matter much about something as sticky as PC-10 because not many people go in for WW1 color. But this is an illustration of something that might come up from time to time.
I don't suppose anyone here has some kind of color reading hardware like the fancy gadgets paint shops use? Something to convert actual color chips into RGB numbers?
Also, is there anyone here with a Methuen color handbook?
I've got pantone and FS decks here as well as both the original and new Monogram Luftwaffe guides with color chips. Also I have Ullmann's Luftwaffe color chips. I think it's really helpful to have something "real" in front of you along with what you see on your screen.