how about mixing powdered suger, flour and plastuer of paris next to a bowel of water
would that work?
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Plaster of Paris, flour and sugar works with roaches. Boric acid is even better. I am not sure if this would work with mice.
I suppose they would die of constipation, and after a while the mouseflesh would rot away and all you would have would be mouse skeletons with plaster tummies and intestines.
Plaster of Paris got its name from the fact that the gypsum mines from where it was originally produced was in the hills around Montmarte, where the artistes like Picasso, Modigliano and Toulouse Latrec used to hang out, because of the low rent and availability of large barns and warehouses.