The fixative is mixed properly and taken into a centrifuge tube and is centrifuged. The sample is mixed with formalin, rinsed and centrifuged three times with distilled water. In this procedure, plasma is centrifuged so an aqueous layer appears. Samples are centrifuged with a high-density solution such as sucrose, caesium chloride, or iodixanol. The test sample is added and the microplate is centrifuged. If the cerebrospinal fluid is bloody, it is centrifuged to determine its color. If not, it is to be filtered or centrifuged and the reading repeated. Suspensions are then centrifuged for 30 minutes to filter out the unexfoliated black phosphorus. The plate is centrifuged and the agglutination reactions are read. The sample is next centrifuged for several minutes. The device was centrifuged to deposit the beads into the wells. The test is performed on whole blood, meaning blood that has not been centrifuged. It is first mixed with heavy syrup and then centrifuged in a process called "affination".