Rahila Ahmed
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Posted 5 year ago
Why is the vein blue when the blood is red ?
1 Answer(s)
Seema Kumari
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Posted 5 year ago Seema Kumari Gurushala Teacher Coach

If Blood Is Red, Why Are Veins Blue? 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.