My favorite color is blue! There are so many beautiful things that are blue.
I love blue too. Its one of the three primary colors.
Oh really? What are the other two?
Red and Green. Blue, on the spectrum of light, lies between violet and green.
That is very interesting, what is your favorite?
 I like Blue. There is an optical effect called Rayleigh scattering that makes the sky and ocean appear blue.
That is incredible. I learned about that in a college Weather and Climate class. Fascinating stuff.
An optical effect called Tyndall scattering explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective.
Blue has been an important colour in art and decoration since ancient times. The semi-precious stone lapis lazuli was used in ancient Egypt for jewellery and ornament and later, in the Renaissance, to make the pigment ultramarine, the most expensive of all pigments. In the eighth century Chinese artists used cobalt blue to colour fine blue and white porcelain. In the Middle Ages, European artists used
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Monopack color films are based on the subtractive color system, which filters colors from white light by using superimposed cyan, magenta and yellow dye images. Those images are created from records of the amounts of red, green and blue light present at each point of the image formed by the camera lens. A subtractive primary color (cyan, magenta, yellow) is what remains when one of the additive primary colors (red, green, blue) has been removed from the spectrum. Eastman Kodak's monopack color films