A painting at a Connecticut museum that has long been thought to be by Vincent van Gogh has been authenticated by Dutch researchers.

The Wadsworth Atheneum Museum of Art in Hartford announced Friday that “Vase With Poppies,” a still life oil painting, has been verified by researchers at the Van Gogh Museum in Amsterdam as having been made by the Dutch artist in 1886, just after he moved to Paris. It has been in the Atheneum’s collection since 1957.

The painting’s authenticity was called into question in 1990 by the art historian Walter Feilchenfeldt, who raised concerns about many purported van Goghs around the world, the Hartford Courant reported. The artwork was taken out of museum displays and shelved.

Years later, with advances in technology and knowledge of van Gogh, the museum decided to revisit the painting.