Differential staining in light microscopy enhances specimen contrast but has notable disadvantages. One major drawback is that the specimen must be fixed on the slide, which eliminates any possibility of observing motility. This fixation can lead to the loss of dynamic behaviors that are critical for certain biological studies. Additionally, the staining process may alter the natural state of the specimen, potentially affecting the accuracy of observations. Overall, while differential staining improves visibility, it restricts the ability to study live, moving specimens.