I Run Cold and Hot

I run cold and hot,
I look blue but am red.

What am I?

Blood. People can be referred to as hot blooded, and certain animals are cold-blooded. Your veins look blue, but the blood is actually red.

Posted in Riddles


11 Comments on "I Run Cold and Hot"

Joshua says
December 30, 2014 @ 05:49

That is a really neat riddle but blood IS blue it only turns red when it comes into contact with oxygen such as when you get a paper cut and start bleeding

Dan says
December 30, 2014 @ 16:53

@Joshua That’s a common belief, but it’s not true. Blood is always red.

fivebee says
December 11, 2015 @ 16:45

Fire. The stove can release some blue fire.

fivebee says
December 11, 2015 @ 16:46

@Joshua, @Dan BLOOD?! F**!!!

Chloe says
February 1, 2016 @ 00:11


Yay says
February 4, 2016 @ 21:06


Roy Grundstrom says
May 20, 2016 @ 15:31

THANKS enjoy them on again

Roy Grundstrom says
May 20, 2016 @ 15:32

Thanks for being back on

Karla Rodriguez says
August 18, 2016 @ 16:47

A Crimp

Yay, shut up says
January 26, 2017 @ 13:47

@Dan uhh actually, it is blue but when it come into contact with oxygen, it turns red

Dan says
January 28, 2017 @ 13:59

Nope, blood is always red, actually. Veins look blue because light has to penetrate the skin to illuminate them, blue and red light (being of different wavelengths) penetrate with different degrees of success. What makes it back to your eye is the blue light.

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