It is essentially due to increased blood flow to the face.
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This is kind of neat. I drew a three dimensional cube. Then divided the faces into 16 squares per face. Then started counting which of those little cubes would have a painted face. I get: 1 red face - 24 cubes 2 red faces - 24 cubes 3 red faces - 8 cubes 4, 5, & 6 red faces - 0 cubes
Draw a three dimensional cube, showing three faces. Divide each face into 6 x 6 =36 squares, representing the faces of the little cubes. Then by inspection it is obvious that no little cube can have more then three painted faces and they will be at the eight corners. Only the edge cubes (not counting the corners) can have two painted faces and there are 48 of then. Finally, only the inner cubes on the surfaces will have one painted face and there are 96 of them. The other 64 cubes are in the inner core and will have no painted surfaces. SO: 6 = 0 ; 5 = 0; 4 =0 ; 3 = 8 ; 2 = 48 ; 1 = 96 . uuuuuu.....
The probability of getting a face card or a red card in a standard deck of 52 cards is (26 + 12 - 3) in 52 or 35 in 52 or about 0.6731.26 red cards, 12 face cards, and 3 red cards that are also face cards.
Red in the face
Mixing red, yellow, and black makes a shade of orange. If you use very little black it will be more recognizable as orange. If you use more red it will be darker, while more yellow will make it lighter.