gum on painting by frankenthaler

a twelve-year-old boy has stuck his gum on the bay, a 1963 abstract painting by the american artist helen frankenthaler, at the detroit institute of arts. staff of the museum already removed the gum, but it did leave a small stain, which will be removed in the future.
frankenthaler is one of america's most important second generation abstract expressionist painters. the bay is one of her most famous works, and is estimated $ 1,5 million.
the boy has been suspended from school.