Colors of Alien Blood: Oxygenation Chemistry Explained

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Discussion Overview

The discussion revolves around the potential colors of alien blood in a fictional context, focusing on the chemistry of oxygenation and the implications for the alien's biology. Participants explore various elements and compounds that could influence blood color, as well as the necessity of blood in the alien's physiology.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant seeks to understand what atoms or molecules can efficiently bind with oxygen, comparing copper's reactivity to iron's.
  • Another participant questions whether the chemical that carries oxygen must also be the one that imparts color, suggesting that hemoglobin serves both functions in Earth organisms.
  • Some participants note that a chemical carrying oxygen is needed in large amounts, and if it has color, it would dominate the blood's appearance.
  • There is mention of Fluosol as a non-colored oxygen carrier, suggesting that blood could be colored through the addition of other compounds.
  • Participants reference the diversity of blood colors in nature, with examples like violet blood in certain organisms.
  • One participant questions the necessity of the alien bleeding at all, proposing alternative physiological responses that could influence blood color without actual bleeding.
  • Another participant raises the idea that the alien's taxonomic classification could affect its blood chemistry and color.

Areas of Agreement / Disagreement

Participants express a range of views on the relationship between oxygen transport and blood color, with no consensus on whether the alien must bleed or what specific compounds would be most efficient for oxygenation. The discussion remains unresolved regarding the implications of taxonomic classification on blood chemistry.

Contextual Notes

Limitations include the lack of specific assumptions about the alien's biology and the dependence on definitions of blood and oxygenation processes. The discussion does not resolve the complexities of how different compounds might function in an alien context.

newjerseyrunner
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I have an alien in one of my stories that bleeds. I want to use science to determine what the range of possible colors would be. It's an oxygen breathing alien, so it's blood has to be efficient at transporting it. I know our blood is red because we use iron to do that. I don't know enough about the chemistry of how oxygenation works to come up with any guesses for anything else.

First off: What other atoms or molecules can bind so easily with oxygen? I know copper reacts with oxygen to turn green, how easy is that process compared to iron?
 
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Why do you suppose the same chemical that carries oxygen has to be the one that causes the color?
 
Vanadium 50 said:
Why do you suppose the same chemical that carries oxygen has to be the one that causes the color?
One obvious reason: hemoglobin does both. Another: a chemical that carries oxygen is needed in large amounts. If it has colour, it would prevail over other coloured compounds in blood.
 
Here's a handy guide for different blood colours that occur in nature:

The-Chemistry-of-Blood-Colours-v2.png
 
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I had no idea that Earth life had that kind of diversity in their blood. I thought most blood was mostly clear. I'm going to have to look through them and see what's most efficient. This creature is highly intelligent, and therefore has a huge energy requirements.
 
snorkack said:
Another: a chemical that carries oxygen is needed in large amounts. If it has colour, it would prevail over other coloured compounds in blood.

But it doesn't have to be colored. Fluosol, for example, is kind of milky, and works just fine as blood. Mix that with something orange, and presto! Orange blood. Or chartreuse. Or mauve. Or...
 
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Ryan_m_b said:
Here's a handy guide for different blood colours that occur in nature:

View attachment 189536
Penis worms have violet blood, neat.
 
I seen someone or something's blood orange?
 
  • #10
newjerseyrunner said:
I have an alien in one of my stories that bleeds. I want to use science to determine what the range of possible colors would be.
Why must he bleed? If he is not made to bleed, then you can stop worrying about what kind of blood has has and its color.
 
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  • #11
symbolipoint said:
Why must he bleed? If he is not made to bleed, then you can stop worrying about what kind of blood has has and its color.
Maybe the alien gets bloodshots eyes when he is over tired, or gets embarassed quite easily( assume he has a similar response to this as humans ). His blood color could show through somehow, even if he does not bleed.
 
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  • #12
@256bits, post #11 is clever. I would also wonder: Does the animal need to be like Mammal, or may it be some other taxonomic category? Only the author ( @newjerseyrunner ) would know this.

edit add: I say this since a different taxonomic category could be important in what kind of blood the animal uses.
 
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