Color
(Venous blood is always blue through the opaque skin).
The appearance of veins as dark blue is a wavelength phenomenon, having to do with the reflection of blue light away from the outside of venous tissue if the vein is at 0.02 inches deep or more. Deoxygenated blood is darker than oxygenated blood due to the difference in color between deoxyhemoglobin and oxyhemoglobin.
Read more about this topic: Venous Blood
Famous quotes containing the word color:
“The intellect,—that is miraculous! Who has it, has the talisman: his skin and bones, though they were of the color of night, are transparent, and the everlasting stars shine through, with attractive beams.”
—Ralph Waldo Emerson (1803–1882)
“To face the garment of rebellion
With some fine color that may please the eye
Of fickle changelings and poor discontents.
Which gape and rub the elbow at the news
Of hurly-burly innovation.”
—William Shakespeare (1564–1616)
“African rights and liberty is a subject that ought to fire the breast of every free man of color in these United States, and excite in his bosom a lively, deep, decided and heart-felt interest.”
—Maria Stewart (1803–1879)