Alien Blood: Difference between revisions
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{{trope}}
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With [[Human Aliens]], this is a very mild case of [[You Fail Biology Forever]]: Since the skin is translucent, a creature with different-colored blood wouldn't have the same skin color as a human...if the skin is white. Darker-skinned aliens, or ones with scales, feathers, hair, or something else hiding their skins avert this problem, albeit probably unintentionally.
Of course, here on Earth, all vertebrates, the largest and most complex members of the animal kingdom, have red
In [[Video Games]], [[Aliens and Monsters]] often have different colors of blood than red, frequently as an optional mode, to appease the [[Moral Guardians]]. [[Family-Unfriendly Aesop|Because it's okay to shoot non-human beings if they don't bleed the same way.]]
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Assuming it's not red like human blood, [[Aliens and Monsters]] most commonly have blood that's either black or some bright color usually associated with something unhealthy, like orange, green, or yellow (blue and violet are possible, but rare). Robots and Cyborgs, on the other hand, are often shown squirting white fluid when damaged (or black, which is arguably oil). The white blood can be traced back to the android in the movie [[Alien]], who was practically overflowing with the stuff and very squishy compared to most robots in film at the time. In a case of reality imitating fiction perflourocarbon based blood substitutes are white and carry oxygen much more efficiently compared to red blood cells.
Not to be confused with [[Blue Blood]], even if it is, in fact, blue. (Though some blue-blooded aliens can, in fact, be [[Blue Blood
{{examples}}
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** Kunzite appears to have hot pink blood (in the episode where a Crescent Beam cuts his hands). Perhaps he's a Klingon?
** In a rather bizarre reversal of this, the aliens Eiru and An from the first arc of the second season have red blood, even though they have green skin and the insides of their mouths are clearly also green.
* The androids in the ''[[Ghost in the Shell]]'' series consistently have white blood, a possible reference to the ''[[Alien
* Magic-users in [[Dorohedoro]] have black particles mixed in with their blood.
* The Aragami of ''[[Blue Seed]]'', being essentially plants, have green blood; this extends to the half-Aragami mutants like Kusanagi, though the latter looks extraordinarily enough not to be mistaken for a normal human. (The color of his blood [[Black Blood|still helps]], considering that he tends to get injured ''a lot''.)
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* One of the princes in ''[[Stardust (film)|Stardust]]'' has literal [[Blue Blood]]. Unknown if it's just because he's royalty, or if all inhabitants of the magical world have such blood, since nobody else in the movie is seen bleeding. [[Word of God]] states the decision for the color was made to avoid an "R" rating, with the added benefit of being a [[Visual Pun|visual gag]] for [[Blue Blood|the character]].
* The Xenomorphs in ''[[Alien (franchise)|Alien]]'' have yellow, [[Bloody Murder|highly acidic blood that can burn through steel]], while the androids have milky white fluid inside them instead of blood. In the later movies, the blood is green instead, possibly as a result of morphing with human DNA.
* The [[Predator
* Not quite aliens, but one of the first hints that the employees of the Titty Twister in ''[[From Dusk till Dawn]]'' aren't human is a close-up of a knife which was just used to stab one of them. Instead of blood, it's covered in a translucent goo.
* In [[John Carpenter]]'s ''[[The Thing (film)|The Thing]]'', blood samples are taken from all the characters and exposed to heat to test which one is the shapeshifting alien. The alien blood, it turns out, is capable of ''leaping around the room as an independent organism''.
** The character who proposed and carried out the test did it because he figured that the blood might well do that, as severed pieces had previously been observed operating independently.
* The monster ''[[Gamera]]'' has green blood. Not that it's ever likely to be useful as [[The Reveal]], but notable anyhow for the sheer volume you will be seeing in any given
** His enemy Gyaos' blood was pink.
* The alien opera singer in ''[[The Fifth Element]]'' has royal blue blood.
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== [[Live Action TV]] ==
* Vulcans in ''[[Star Trek]]'' have green copper-based blood, not unlike Earth insects.<ref>In reality, Cyanoglobin (the oxygen-carrying pigment that is the copper-blood equivalent of iron-based haemoglobin) does not carry oxygen very efficiently, which is why molluscs like squids and octopi tend to operate on a 'dart and rest' principle.</ref>
** To a limited extent, ''[[Star Trek]]'' did [[Shown Their Work|Show Their Work]] in that Leonard Nimoy's make-up did tend towards a more greenish cast than everyone else's. It did take several tries, however, to get this to work the way they wanted when combined with the lighting and the other make-up, which occasionally had hilarious
** The shapeshifters of ''[[Star Trek: Deep Space Nine|Star Trek Deep Space Nine]]'' once caused some paranoia over their infiltration capabilities. As such, Starfleet briefly initiated required blood tests of officers and their family, as any of the shapeshifters' substance removed from their body would instantly revert to their protoplasm. Reassuring? Not quite, as Captain Sisko's father proceeds to point out that if he were a shapeshifter, he'd just kill some poor shlub and use ''their'' blood to get around the test. The fact the idea is introduced by someone who later proved to be a changeling infiltrator didn't help.
** The Andorians have blue blood, which is just icing on the cake since they also have blue skin and antennae. Bolians also have blue blood (and, again, blue skin).
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** In "[[Doctor Who/Recap/S18/E04 State of Decay|State of Decay]]", the Doctor's blood is blue. In every other episode of the series where he bleeds, it's normal red.
** In the movie it's red, but is different enough from human blood on a cellular level that Grace describes it as "not blood" when she looks at it under a microscope.
* ''[[Babylon 5]]:'' The Drazi have white blood. On the other hand, the other major
* Basco ta Jolokia of ''[[Kaizoku Sentai Gokaiger]]'' is shown to have light bluish-green blood {{spoiler|when he dies}}.
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{{quote|'''Captain''': With pulpy bits? '''EEEWWWW!'''}}
* The [[Our Trolls Are Different|trolls]] of ''[[Homestuck]]'' have a complex caste system based on the color of their blood. Each known troll has a different blood color, spanning the entire color spectrum. The highest castes have literal [[Royal Blood|Royal (Purple) Blood]], while the lowest castes have brownish red blood. Trolls higher on the spectrum live longer lives and tend to possess greater physical strength, while rustblood colors tend to have greater psychic powers. Greenbloods (the middle colors) tend to be more emotionally stable. Additionally, Karkat, Kanaya, and Feferi, have rare & special blood-types.
** Karkat's blood is a
** Kanaya has jade blood, which also lets her enjoy Alternia's blistering sunlight and be awake during the day when the undead normally stir, making her Alternia's [[Goth]] equivalent. It also marks her as one of the only trolls to be raised by a virgin mother grub and one responsible for raising its egg.
** Feferi's blood is literally [[Purple Is Powerful|royal purple]], making her heiress to the throne, because it physically grants her protection from the [[Brown Note]] of her [[Eldritch Abomination]] guardian even at it's [[Apocalypse How|highest level]].
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== [[Web Original
* Most of the aliens living on Earth in the ''[[Global Guardians PBEM Universe]]'' bleed red, especially the Tautiq and the Pelkons (who are basically [[Human Aliens]] and [[Rubber Forehead Aliens]], respectively). The Delethai are the exception... they bleed orange.
** Sweet Synn and Black Angel, both of whom are demons in human form, bleed a thick, black ichor that smells vaguely of sewage.
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