What color does the cytoplasm of protozoan cysts stain in the iodine wet stool preparation?

The cytoplasm of protozoan cysts stains yellow-brown in iodine wet stool preparations due to the interaction between the iodine and the cellular components of the cyst. Iodine serves as a stain that highlights structures within the cysts, facilitating their identification under the microscope. The yellow-brown color helps distinguish protozoan cysts from other fecal components, making it easier for laboratory personnel to assess and identify potential parasitic infections. Understanding this coloration is crucial for accurate diagnostics in clinical microbiology.