Azraeth wrote: I addressed this here.
Basically the idea is that vampire blood kind of has a life of its own outside of the will of the vampire. Not like a conscious mind, but a desire to perpetuate its own existence so it doesn't operate the same way severed limbs do. A vampire's body itself is (to an extent) a projection of the vampire's perception of their existing state, whereas their blood is independent of that.
I'm not 100% sure where I read that, but I remember researching the topic in the wiki and by looking at past answers you (David) made on the subject before arriving at that conclusion.
I'd say that blood would eventually fade, but only because the belief that vampire blood ashes has become so popular and is used so much. I personally don't like the idea of modifying canon for the sake of popularity, but I also don't want to force people to change a lot of existing RP.
Suffice it to say that if vampire blood does ash, or fade, it would not be immediate. So a vial system could work just fine.
@ David: I think that's what you're asking? Let me know if I got something wrong XD
Yeah that's more or less what I thought we'd both said in the past. Thanks!