A water-soluble cellulose ether is selected by judging whether the number of undissolved fibers having a size of 16-200 m is up to 350 fibers/2 ml in a 0.1 wt % aqueous solution of the cellulose ether at 25 C. This water-soluble cellulose ether forms an aqueous solution which can be filtered without clogging and can form a very thin film without defectives.

 
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