Upon drying, replace filters into a desiccator for 30 minutes. A stopcock may be included to permit the desiccator to be evacuated. The crucible with the sample and lid is allowed to cool in a desiccator. Neither of these hydrates can be dried using standard desiccator methods. It is then stored in a desiccator until characterization. Desiccation is generally performed with a desiccator. Remove two filter papers from a desiccator and record the weight of each. After 30 minutes in the desiccator, the filters are to be weighed.