Postal Stationery Paper Color Question (Probably Again?)

Gotta weigh in here as I too was (still am!) having trouble identifying cut square paper colors. I dug around and found this thread which -most definitely- helps me out and I've saved it so I can go back to it with a click or two. I found the Scott Specialized to be useless for this and the new 4th Ed 2017 Cat of 20th & 21st Century Stamped Envelopes & Wrappers of the US to be helpful but still leaves much to be desired as it relates to paper colors. I know colors are hard to get right with computers and when they are printed too so I have to say ~THANKS!!!~ for this thread as the pics in it have been more helpful than anything else I've found so far. Now back to more head banging... :)