1. Leave it to cool in a desiccator and weigh.

2. Weigh it after it has been cooled in a desiccator.

3. Desiccator, containing freshly activated silica gel or an equivalent desiccant with a water content indicator

4. Between 133 °C and 135 °C, after vacuum drying for four hours in a sulphuric acid desiccator

5. Allow the crucible to cool in a desiccator to ambient temperature and weigh rapidly.

6. After cooling, complete the weighing of the weighing bottle within two minutes of its removal from the desiccator.