The blood is a reddish coloured fluid, while the lymph is completely colourless in nature.Lymph fluid is a part of the lymphatic system, while the circulatory system consists of blood.Lymph helps in the immune system of the body while blood oversees the transfer of nutrients and oxygen.Lymph consists mainly of plasma and a little number of WBCs and platelets; in contrast, blood has a relatively high number of WBCs and platelets, blood also contains a large number of RBCs, but even their major component is plasma.The moment in lymph is generally slower than the blood, and lymph only flows in a single direction, while blood moves in a circular motion.