Journeys: Blood. Stop 4

Blue veins

Experiment! Look at the inside of your wrist. Can you see thin lines? Those are veins.

What colour do the veins look? Tap the colour!

Bluish, aren't they? Now here's a secret.

Greenish, aren't they? Now here's a secret.

Red? Look again, they look bluish.

The blood in veins is dark red. But the skin lets only blue light reach the vein, so veins look blue.