The major advantage of the light microscope is it allows the observation of microscopic living things. When a specimen must be prepared for observation, the object should always be viewed as a wet mount. The specimen is placed in a drop of water or other liquid held between the slide and the cover slip by surface tension. This method is commonly used, for example, to view microscopic organisms that grow in pond water or other liquid media, especially when studying their movement and behavior. Care must be taken to exclude air bubbles that would interfere with the viewing and hamper the organisms’ movements. An example of a temporary wet mount is a Lactofuchsin mount, which provides both a sample mounting, as well as a fuchsine staining.