Discussion

Before milk is added to the water in the container, the light striking the reflecting screen has the full spectrum of colors. After milk is added, the light that passes through the suspension of milk micelles without being scattered is primarily at the red end of the spectrum. This confirms our earlier, more qualitative observations and conclusions about what wavelengths of light are scattered (shorter wavelengths) and the approximate size of milk protein micelles (about the same dimensions as the wavelength of blue light).