From:Jeff Silverman

Incomplete dehydration or water contamination of your last absolute alcohol or xylene will result in cloudiness as will use of too much mounting medium. Take a slide wet with clean xylene and place three drops of resinous mounting medium over the tissue where they will spread in the xylene.  Place the coverslip on an angle one edge first and gently lower and blot excess fluid by placing the edge on a gauze or paper towel. Press bubbles gently out with needle. No fingerprints.
Jeff Silverman

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