I have just taken a physics test in my high school in which one question posed that a positively charged rod is held near two uncharged spheres being held by silk filaments. Sphere 1 is held by a dry silk filament while Sphere 2 is held with a wet silk filament.
edit: the ceiling is made of steel so the filament would be conducting the negative charge to the ceiling.
The second filament eventually dries. One part of a question was essentially asking if the second sphere was charged negative, positive, or neutral after the filament dried.
I reasoned that the second sphere would be positively charged because the filament would conduct the electrons from the sphere and evaporate, carrying the charge with it. This would leave the sphere with less electrons? Many people said the rod would induct electrons from the sphere because it was a conductor. But the sphere itself was not wet so how could it be a conductor?