Blue Blood
Until quite recently, my boyfriend fully believed that deoxygenated blood is blue, it took quite a lot of persuading to make him believe otherwise. Apparently this is actually a very commonly helf belief.

He also thought that the word 'advert' was 'ardvert'.

That's all I can think of off the top of my head tbh.
(AyeMe, Sun 21 Mar 2010, 12:25, 11 replies)

I thought this for years
simply because of the arteries or veins you can see on your wrist
( morrybyte made a subtle namechange at, Sun 21 Mar 2010, 14:18, closed)

I still do think this...
Why are the veins in your wrist blue, then?
(dxg, Sun 21 Mar 2010, 16:01, closed)

Likewise
A lot of people think it correct to refer to a Scottish single malt as "Scotch".
( Je suis un vagabond is an unfunny, up your own arse middle class knob, Sun 21 Mar 2010, 14:57, closed)

I still do think that
Because of the visible, blue blood vessels under your skin. And the fact that I've never seen deoxygenated blood. It turns red the instant it leaves your body, of course!
(Falstaff's Spiritual Successor, Sun 21 Mar 2010, 15:57, closed)

You'll see it if you ever have blood taken.
It's dark red instead of bright red.
( Bob Todd whee, Sun 21 Mar 2010, 17:37, closed)

Well of course it is. There'd be a small amount of oxygen in the tube or syringe. Not enough to make it bright red, but enough to stop it being blue.
(Falstaff's Spiritual Successor, Sun 21 Mar 2010, 18:36, closed)

You're kidding right?
What magical property is blood supposed to have that causes this colour change from one primary colour to a completely different primary colour?

Also i'm not sure there would be oxygen in a syringe, isn't it like a vacuum?
(AyeMe, Sun 21 Mar 2010, 18:47, closed)

Chemistry is magic?
Learn some chemistry, then you'll know about this magical colour changing stuff.

Look up stuff about metals, their oxidation states and their salts.

And then look up haemoglobin.
(Honourable Member is upstanding, Mon 22 Mar 2010, 1:26, closed)

It's Witch Craft it is!
That's why I *deliberately* failed biochem, I refused to take any part in that heathen practice!

I guess I deserve to be in this QOTW for that one.

But I still refuse to believe that blood is ever blue (in mammals anywyay).
(AyeMe, Mon 22 Mar 2010, 7:12, closed)

No, it isn't blue.
Why don't you ask someone who knows what they're talking about? www.askabiologist.org.uk/

Veins look blue under your skin because a lot of stuff looks blue under skin. Melanin is brown when it's in the right place (close to the surface of the skin) but if it's too deep it appears blue. Babies are sometimes born with a blue patch on their lower back, which is a deposit of melanin. The Japanese even have the phrase 'his bum is blue' which is equivalent to our 'wet behind the ears'.
( Bob Todd whee, Sun 21 Mar 2010, 21:20, closed)

guilty
I actually summed up the courage to ask a nurse who was taking my blood. She didn't tell me the answer and instead stopped what she was doing to go tell a co-worker and then they both came back to laugh at me.
(SkoaL, Mon 22 Mar 2010, 13:53, closed)