Polka-dot paint
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Polka dot paint is a paint of "polka dot color", i.e., a paint which paints an object with a polka dot pattern.
The paint is traditionally the subject of a fool's errand prank played upon apprentices in the decoration or construction trade, who are sent to fetch a bucket of polka-dot paint.[1][2][3] A polka-dot paint effect has been produced in stage magic, and in the 1950s a polychromatic paint was invented which produced a dotted effect when dry.