What does milky plasma mean?
Similarly one may ask, what causes milky plasma?
Lipemia is presence of a high concentration of lipids (or fats) in the blood. When donated blood is lipemic it causes the plasma-containing products to have a milky appearance.
Similarly, you may ask, what does it mean when plasma is cloudy?
Turbid, cloudy or milky serum (lipemic serum) may be produced by the presence of fatty substances (lipids) in the blood. Bacterial contamination may also cause cloudy serum. Moderately or grossly lipemic specimens may alter certain test results.
The color of a plasma is determined by the photons, which are emitted when the electrons recombine with the ions (or when excited electrons relax into a lower energy state). The photon energy and, hence, it's wavelength (which determines the color) is dependent on the energy difference between the two energy levels.