Not much at this point, Drew-- McClung had 6000 covers, dated by month and year, and when he sorted them, the colors started to show a pattern by year and time of year. I've probably got 100 covers. It's a long term project.
A couple of things I CAN identify from literature available, mostly in "The Chronicle" which is the periodical from the USPCS-- are the stamps in late '62 and '63 which are pinkish, and bright, but are actually rose, and aren't pink at all-- referred to as "Brooklyn Pinks" or "commercial pinks", and I've got, I think a couple of those. There was one brown in '61, "brownish carmine rose", and I think I have that one.
It's all fun, challenging, and really long term. I do have a certed pink, a certed rose pink, 3 Weiss-ID'd rose pinks, a McClung rose pink on cover, and at least 3 covers from '61 that may have some pink. I'll probably send them in sooner or later for ID or for a cert.
Bottom line is that to be pink, or rose pink, the stamp should not be dated later than early in '62. Remember that the pinks were first, and unstable, so they tried to add small amounts of other colors to try to stabilize the color....first carmine and lavender (and from those 2, they ended up with the famous "pigeon blood") and then rose. Pink is August '61 to Early '62. Rose and pinkish roses until '63, then the reds and browns are mostly later.
Another bottom line is that if you see a cover on
ebay that the seller says is "Pink", and it has a cancel showing 1863-- it may be "Brooklyn Pink" which is probably pinkish rose (which is #65, where rose pink is 64b), but IT AIN'T PINK!
Hope this helps-- Ray