How does the lymph form? What is its composition?

Lymph is derived from the tissue fluid by means of fine and irregular lymph capillaries. Though the composition of the lymph varies, about 94 % of the lymph is water and 6 % is dissolved substances, i.e., proteins, fat drops, carbohydrates, non-protein nitrogenous wastes, hormones, inorganic salts, gases, etc.