- Components both fix and provide stain color - Contains Merthiolate (Thimerosal) and Iodine that act as staining components - Formalin acts as a preservative - Useful for fixation of intestinal protozoans, helminth eggs, and larvae - Disadvantages: Contains mercury compounds (thimerosal) Staining of preserved stools in MIF yields unsatisfactory results or not as good as Schaudinn’s fluid