Air bubbles in wet mounts can also have beneficial effects. They may supply ciliates and other organisms with oxygen.
A wet mount uses a liquid mounting medium, in most cases water.
Why use phosphate buffer when making a permanent slide of cheek cells?
This post explains how to make a wet mount. Video included!
It is possible to use non-toxic stains (such as ink for fountain pens) to stain yogurt bacteria in-vivo.
A wet mount (or temporary mount) is one of the most common ways of observing specimens under the microscope.