Well, CC once put out a list of his colors and at that time he listed these different blacks:
Depth Black
Exxxon Black
Sinter Black
Pasties Black
Stardust Black
Also I've heard talk of "hardcore black", but that might have been people conflating it with "hardcore white". Anyway, I've had conversations with other collectors about black Clacks, and the consensus opinion among the "experts" is that there was only one kind of black ever made. But, I have seen different shades as well. Only Click Clack himself could really answer this mystery of the blacks.
I think we covered this already, but the bigger mystery to me is the Purples. There is a great variability in what people call P1 Purple. I dunno if they are all P1's or if they are actually other kinds of purple, and people are just mistaken about the name. CC's list of purples included the following:
Absent Purple
Gum Purple
Icy Purple
P1 (purple)
Masters of the Universe (MOTU) Purple
Midnight Indigo [nothing looks like this one]
and
Milk Purple
Concrete Purple
Milk and Concrete are difficult to distinguish from each other as well. I have a "concrete", but I'm not sure it's not "milk purple".
Understanding Clacks is like peeling an onion, for every layer to peel off, there are even more layers of mystery underneath. Welcome to the club t2russo.