Replicants as an Antagonist

[Zadeon]

Getting an idea from alien replicants, how about you can store a limited amount of blood in you, and when that runs out you start bleeding either motor oil or white blood. You would start with this full of blood that is your own. Once it empties it can be refilled with other blood, but it will NOT be your blood. This would allow another way to test for replicants: if the blood is not theirs or is white. Also it can be turned on or off if you want to save it.