Blood is opaque

[Nader393]

No, this is not a metaphor for unity, especially on this day. I am being concrete.

I recently saw an otherwise excellent movie, that used a lot of blood that looked like the dyed corn syrup that movies generally use. It was translucent and syrupy. You'll see this on TV as well (Walking Dead, crime dramas, etc). Blood is actually opaque. It's full of iron, which makes it red, and is why you can't see through it.

Lifted this picture from a Jalopnik article where someone complains about working on a car. This is what the real thing looks like:

[DaWildBeast]

I dont understand. Are you trying to fire shots at millenials or what?

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[MR E30 325is]

Whoa........

[Nader393]

I dont understand. Are you trying to fire shots at millenials or what?

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Sorry, you're right, that sounds bad. I'll edit.

[ELVA164]

Hemoglobin makes it red, but you're right about the opacity.

Fun fact: Many people seem to think dark blood means a higher concentration of oxygen, but that's not the case. Darker blood is less oxygen-rich, and bright blood has more oxygen.

Fun fact 2: Veins only appear purple because of their relatively shallow depth beneath the skin, and only look that way on white people. They can look green in people of Indian descent, for example.

[Nader393]

Hemoglobin makes it red, but you're right about the opacity...

Hemoglobin binds the iron, which makes it red. Horseshoe crabs have hemocyanin which binds copper to transport oxygen, which is why their blood is blue.

[ELVA164]

Good point, we'll call it even!

They use that blood for some sort of medication, right?

[FredK]

The blood is mostly used for the limulus amebocyte lysate test, which is used to detect fever causing residues (pyrogens) from the manufacturing process in injectable drugs and blood-contacting medical devices.

I've worked on a blood-contacting device that required characterizing device pyrogenicity as part of a biocompatibility test suite.

[BillBrasky]

The blood is mostly used for the limulus amebocyte lysate test, which is used to detect fever causing residues (pyrogens) from the manufacturing process in injectable drugs and blood-contacting medical devices.

I've worked on a blood-contacting device that required characterizing device pyrogenicity as part of a biocompatibility test suite.

Hick

[Farbin Kaiber]

The blood is mostly used for the limulus amebocyte lysate test, which is used to detect fever causing residues (pyrogens) from the manufacturing process in injectable drugs and blood-contacting medical devices.

I've worked on a blood-contacting device that required characterizing device pyrogenicity as part of a biocompatibility test suite.

And this whole time I only thought you were well versed in IBU's.

[FredK]

Hick