Question

why r our veins blue ?

Answer 1

Hey mate, here is your answer.: -)

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.

HOPE it helps to you!!!

Answer 2

veins look blue becoz light had to penetrate the skin to illuminate them, blue and red light penetrate with different decrease of success .