DETROIT — A 12-year-old visitor to the Detroit Institute of Arts stuck a wad of gum to a $1.5 million painting, leaving a stain the size of a quarter, officials say.

The boy was part of a school group from Holly that visited the museum on Friday, officials say. They say he took a piece of Wrigley’s Extra Polar Ice gum out of his mouth and stuck it on Helen Frankenthaler’s “The Bay,” an abstract painting from 1963.

The museum acquired the work in 1965 and says it is worth about $1.5 million.

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Personally, I think the gum may have been an improvement.