An Official Alien Theory Explains Why the Xenomorphs’ Acid Blood Is So Inconsistent

Fans became aware of the Xenomorphs’ acid blood in the very first Alien film when the crew of the Nostromo tried to remove the Facehugger from the face of one of their colleagues. In that introductory scene, just a few drops of the acid burned through multiple floors of the ship with ease. However, at the very end of the movie when Ripley shoots a grappling hook through the Xenomorph itself, its blood doesn’t disintegrate it. So, what’s up with this inconsistency in just one movie? Well, one official theory regarding the Xenomorphs’ acid blood might have the answer.