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the claim

Human blood is red both when oxygenated and when deoxygenated, with deoxygenated blood a darker red, and it is never blue.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
2 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that human blood is red both when oxygenated and when deoxygenated, with deoxygenated blood a darker red, and it is never blue?

Yes. Two reference sources state that human blood is red in both oxygenated and deoxygenated states, with deoxygenated blood a darker red, and that the blue appearance of veins is an optical effect rather than blue blood.

Verdict: SUPPORTED · 2 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 2
Is deoxygenated blood blue?
2011
Get citation
Is deoxygenated blood blue?. (2011). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/2744/is-deoxygenated-blood-blue

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More for · 1
Blood red - Wikipedia
Get citation
Blood red - Wikipedia. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Blood_red

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