I cant seem to get MUTHUR site to work so have never tried, but information can be a bit buggy... but there is some specific information there that has to be considered a clue.
Shame it was a bit buggy as it puts doubt on any of the information.
Indeed the Sacrificial Goo and Black Goo in the Urns was a long term theory i shared that they was different and the results of the Urns is via something related to the Xeno being Sacrificed like the Sacrificial Engineer and the result stored in the Urns.
I cant see why they clearly know and have a label for the Black Goo but its unknown with the Sacrificial Goo...
I can only assume they do not know the origin of this stuff and its either unknown to Weyland Yutani as they have never encountered the Sacrificial stuff... or have any information... or its intended to show us the Engineers did not know about this stuff as far as details and its because they Stole it?