Do not place the lid on the countertop with the grease side down. The grease will pick up dirt, preventing formation of a seal. If a lid can be directly lifted off the desiccator, either the desiccator was not properly sealed or, more likely, it needs fresh lubricant. Rubber stoppers in the lid should always be pliable. Sample dishes should not be packed excessively tight in a desiccator.
Air movement is necessary to cool sample dishes.
Dishes should not touch each other. Desiccator lid should be left open for minimal amount of time. Desiccant should be checked periodically and dried. Replace twice annually. Use of desiccant with color indicator for moisture is recommended.