<prompt> Chicken fat clot isPostmoem clotThrombusInfractAll  <response>: ref Robbins 9e p125 At autopsy, postmoem clots can sometimes be mis- taken for venous thrombi. However, the former are gelati- nous and due to red cell settling have a dark red dependent poion and a yellow chicken fat upper poion; they also are usually not attached to the underlying vessel wall. By contrast, red thrombi typically are firm, focally attached to vessel walls, and contain gray strands of deposited fibrin 