User blog comment:CorbeauKarasu/User Theory Discussion/@comment-1318060-20100810193121

It is an interesting supposition, surely, but I'm not so sure I'm sold on it. You make some valid points, but judging by what we've seen, I think it would be a mistake to assume that Maroh's Stone had any more souls to it than the two that were given to Kimblee. Just because he stole the research data does not mean that he left the laboratory with more souls and if the array we were shown in his own flashbacks is any indication, the number of souls placed into each lab-manufactured Philosopher's Stone is roughly 13 to 15 and doesn't appear to leave much room for change. One could posit that, since the Ishval Civil War was aout seven years ago, the researchers involved could have (and likely would have) experimented with adding more souls to the array, but since Marcoh stated explicitly that he ran away immediately following the war, his sample is from back then as well. In that regard, it would make more sense to say that the stone Kimbee was given by Envy upon his release from prison would likely be the one to contain more souls - and even that is only assuming their laboratory formula had changed since 1908.

Now, considering the Stones the Homunculi have were not made in a lab, but rather siphoned off from the larger stone inside Father, it is a logical conclusion that whatever differences there are between the Homunculi's cores and the lab-manufactured stones would be due to a greater number of souls as well as a greater expertise used in their creation, but it can' be confirmed outright. Lust's Stone was solid and crumbled to dust when she died and Envy's Stone was sort of like a gelatin. One could argue that this is due to their level of "soul exhaustion" or whatever, but the fact that multiple people have stated that the Philosopher's Stone may come in different forms makes me the most skeptical.

In regards to the idea of Homunculus blood as "Stone runoff", I'm still not convinced. Lust and Greed stated that aside from the Stone, a Homunculus' physiology is identical to that of a human's, meaning that stone or not, they need blood to function properly and their blood is likely the same as human blood. Aside from that, the Homunculi are always bleeding. If their blood were Philosopher's Stone runoff, wouldn't that mean that they are constantly leaking Stone energy out onto their surroundings while in combat?

There's room for discussion, surely, but not enough indisputable evidence that it should be outright included on the Philosopher's Stone page, I think.