The painting turned out to be a watercolor by the English artist J.M.W. Turner. Born in 1775, Turner is “perhaps the best-loved English Romantic artist,” as London’s National Gallery writes.

“Watercolor Horizons” brings together J.M.W. Turner’s luminous works from the collections of the Taft Museum and Cincinnati Art Museum as part of a worldwide celebration of the landscape ...

it was later attributed to English art critic John Ruskin. According to Christie’s, which reattributed the work to Turner, the watercolor is worth at least ten times more than a Ruskin-made ...