I don't know if others' are familiar with Richard Morris' color guides, but I purchased the "Three Cents Washington 1861-1862" from Phil Bansner a few months ago. I just checked and it is not on his site now, although other color guides are.
It is a folder with a few pages of literature, explaining how over 50 shades of the 1861 3c have been identified, and then ranks 14 of the colors according to rarity. Here it also states that "Pigeon Blood" has been expertized from 2 colors: "Lavender Pink" and "Carmine Pink".
It then also contains 12 color tiles for identifying some of the colors. I'm red-green blind, so I have a really difficult time with color, but it is a relatively-inexpensive resource (I spent about $20) for it. Richard Morris' card is included, feel free to contact me if you'd like the contact information.
BTW, I did get a good cert for a 64 from Bill Weiss a couple of weeks ago....I purchased the stamp-- didn't find it

