One of those octo's could just be faded as well, not that uncommon.
That's a good theory. However after reading your post, I took a look at the bottoms, and they are the same colors as the outsides. Also, the darker one is the one that appears to be used, whereas the lighter one appears to be unused. After putting them both on my black board, the difference is more noticeable. So I'm thinking these are either different pinks, or at least made from two separate runs.
Hurry up and find an F2 Black so we can see it, t2russo.
![Smiley :)](https://cdn.geekhack.org/Smileys/solosmileys/smiley.gif)
I'm also guessing it's a very dark grey, which would probably look pretty cool with Dolch.