Division 6.5.8 Rinse the outside of the neck of the extraction flask with a little of the mixed solvent (4.6.), collecting the rinsings in the fat-collecting vessel and taking care that the mixed solvent does not spread over the outside of the extraction flask.
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If desired, the solvent or part of the solvent may be removed from the vessel by distillation or evaporation as described in 6.5.12.