“Plasma donation?”

Red and clumpy plasma usually means that the red blood cells (RBC), have ruptured and decomposed, which a process know as hemolysis. Smokers are more prone of having reddish-orange plasma due to the contaminated lack of oxygen in their system. A normal plasma color is light yellow. The color is due to bilirubin, carotenoids, hemoglobin and transferring.. Plasma contain many thousands of distinct lipids. The main categories are fatty acids, glycerolipids, glycerophospholipids, Sterols, Sphyngolipids and phenols. They contain chylomicrons, very-low density lipoproteins (VLDL), and high density lipoproteins (HDLP). all these proteins are measured in blood.

Yes, likely lipids, usually "fats". How much you have circulating depends on your diet.

I hesitate to comment not having seen with my own eyes sorry. Pheresis should leave most of the lipid out of the product because it floats in a higher layer, but there is always some mixing