If either of you have a concealed container like a jar, then a sample can be taken. Otherwise, this will be lost and soon.

[Alucard folds his arms over his chest, and considers Hilda's suggestion of a cavern. That sounds plausible, and he nods quietly to concede the point.]

If there are caverns, we need to consider how we'd want to approach in terms of lighting and in case of cave ins or other issues. And to your point about blood, Hilda, I think the answer is yes. Petra?