Where was the Xenomorph having Acid Blood first referenced?

Alien DNA
MemberOvomorphMay 19, 20122739 Views9 RepliesI know in Alien the face hugger has acid blood and it's said to be a defense mechanism, but I don't seem to remember that particular film showing the Xeno to have acid blood or being mentioned, maybe it's just naturally assumed to have the same biology as the hugger. In Aliens during Ripley's inquisition in the beginning of the film she states that it had acid for blood. I guess my real question is whether Ridley intended the Xeno to have acid blood or just the face hugger. I know most of you have a much more vast knowledge on the facts of the films and might know something about this or if I missed something in Alien that references the Xeno having acid blood aside from the face hugger.
While were on Aliens some things I noticed while watching it is that Burke seems to imply that the company has recently gotten into terraforming while Ripley has been in cryo for 50something years and he explains it to her as if it's something new to her, even the "Building Better Worlds" slogan. Terraforming is a big theme, timeline wise anyways, of Weyland Corp.. Wouldn't this conflict with Prometheus just slightly?