A microscopecover slip is either a thin piece of glass, or more commonly, plastic, that is placed over the slide of examination for a microscope. It is wet, then placed onto the slide sideways, then twisted straight. This process is to avoid air bubbles.
Plastic coverslips are just that. Very thin plastic strips used to coverslip cells normally used for microscopy, microcompression, and counting of aerobic microorganisms. They are not really ideal for everyday coverslipping, because it can be harder to see through than the thin glass coverslips most people are used to.
In cytology, PAP is a shortened version of the name Papaniculeaou, for the originator of this stain. Once a cytology specimen (body fluid or fixative solution containing cells) has been properly placed on a slide, it is dried for 30 minutes to 1 hour before staining. The staining procedure is as follows: 8 minutes in 95% alcohol, followed by 1 minute rinse in distilled running water, 2 minutes in Gill's Hematoxylin, 1 minute in distilled running water, 1 minute in Scott's Water (a "blue-ing" agent), 10 dips in 70% alcohol, 10 dips in 95% alcohol, 2 minutes in OG-6 (orange stain), 10 dips in 95% twice, 2 minutes in EA-50 (a green and pink mixture of stain), 10 tips each in 95% alcohol twice, 100% alcohol twice, then 10 dips in a Xylene/100% alcohol mix, and 10 dips in Xylene before coverslipping.