Assertion: vein | /r/CapableOf | look blue
Facets:
Source sentences:
text: Your blood is always red, even when it is deoxygenated, so why do your veins look blue?
text: Veins appear blue because the subcutaneous fat absorbs low-frequency light, permitting only the highly energetic blue wavelengths to penetrate through to the dark vein and reflect back to the viewer.
text: 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.
text: It is not the blood but the veins that "look" blue, and even then it is not the actual color of the vessel.
text: The veins you see through your skin appear blue because red light goes through the skin much more easily (and thus more) than blue light.