Not all black goo?

I think the stuff David infects Halloway with is different than the stuff that is seeping from urns... Why have something encased in "glass-like" ampules if it can just leak out? While dangerous (who would do this) it's almost like the black goo is the activator for whatever is inside the ampules (inside the urns) or it is a mutating agent...or perhaps it is a safety deterrent (a la those not capable of handling the ampules will get sick and die) If the stuff inside the ampules is the "good stuff" then it is likely that it is DNA modifying/bonding material that turns the exposed into something (it's the essence of another life form... Be it engineer or frog from the moon of zenith) It seems obvious David can read and understand all of the writings on the walls and thus it is likely at some level there is text explaining what everything is the urn chamber actually is. Hence, David is "trying harder" to create an engineer? Seems unlikely that he would just experiment on Halloway without any preconceived "thesis"... I am convinced that the contents of the ampules and the seeping goo must be different. (again hence why the opening scene liquid looks different than the river of black goo on the ground)