Did they remove the solids from the blood as I mentioned here? As I understands it, the solids will spoil and produce a foul smell but the serum will not. A lot of paint recipes don's say anything about separating the two, but to me it seems like it should certainly be done. It should be mentioned though, this would also be an exterior application.

It apparently used to be common practice in some places for people with dirt floor houses to pour the serum on their floors to help harden them. Linseed oil was also apparently used in this way...

DLB