What is the coloration of glycogen when stained with the Langhan's iodine method?

The coloration of glycogen when stained with the Langhan's iodine method is yellow. This method involves the use of iodine which complexes with glycogen to produce a characteristic color that helps in identifying the presence of glycogen in tissue samples. When iodine interacts with glycogen, the reaction results in a yellowish coloration, aiding pathologists in visualizing and assessing glycosylation patterns within a sample.

The yellow color is distinct and is a result of the selective binding of iodine to the polysaccharide structure of glycogen, distinguishing it from other cellular components that may present different staining properties under the same method. This highlights the utility of the Langhan's iodine method in histopathologic studies, especially in circumstances where glycogen levels are pertinent to disease diagnosis and tissue examination.