Color

What is it that makes certain wave lengths bounce off an object? Why is grass green? And blood red?
Pigment found in an object is what gives it color. The color of an object is the only color not absorbed by it. For example, grass is green because grass absorbs every color except the color wavelength for green. Blood is red for the same reason; every color is absorbed by it except the wavelength for red. This same concept applies to everything we see with color in our daily lives.