

I had read somewhere that it may have represented semen back in the Alien days. There is a lot to it but that's the quick down and dirty.

I always thought it had to do with movie ratings and the amount of blood they could show.
Knowing it was a genuine idea to make things creepier...i like that!
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I think the white blood from Ash was representing semen- sexually suggestive as was his trying to basically rape Ripley with a rolled magazine- imitating the face hugger that also represented a form of rape. It tied in with the sexually suggestive works of Giger. I cannot find the source, but am sure it was a reason given by a reputable source- many people are saying it!


There's that, yes, but as Freud said;
'Sometimes a cigar is just a cigar'.
I think they were just going for something 'jarringly-foreshadowing' of Ash's true nature that gets revealed when Parker takes his head off.
A 'wtf?' thing to get the audience's attention and get them wondering what's up with Ash.
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Well, RS at least partially backs up the clame less than 2 minutes in. Just so you don't think I'm a sick bastard lol!
https://www.youtube.com/watch?v=DN2hAOkOjL8

Did you say milk and androids????
It is for the COOKIES!!!!

I'll go with BlackAnt on this one. :D
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@DK
Indeed Sexually Frustrated ... a CHIP of the OLD BLOCK would you not say ;) (in David that is).
I think Basically it comes down to Aesthetically to make them APPEAR to NOT be Human, so its always that PLOT DEVICE to know your NOT seeing a Human but a Android.
If Bishop had RED BLOOD then Ripley would maybe have NOT Discovered for some Time that he was a Fricken Robot ;)
So Indeed without that then a Human and Android would be HARD to Distinguish Apart and so WHILE they look like us on the Outside they are Different Internally and i think having WHITE BLOOD plays the Part and Looks the Part.
WHY would a ANDROID need BLOOD?
Now thats a another Question, to a Degree.. we can only Speculate that its NOT just for Aesthetics, but is maybe something that the Androids require to Operate Efficiently, like a Android Oil/Lubrication.
David must have LOST a Lot of this Fluid in Prometheus and maybe this is WHY he went a BIT BONKERS LOL
Maybe Walter could have been so KIND as to TOP HIM UP?
R.I.P Sox 01/01/2006 - 11/10/2017