— LONDONA small 17th-century interior scene long held in a private Dutch collection has been acquired by the National Gallery and attributed, after a decade of forensic study, to Johannes Vermeer — an addition that the museum's director called, in a measured statement on Friday, "a quietly transformative event for the collection."

The painting, an unfinished domestic scene of a woman at a window, has been the subject of unresolved scholarly debate since the late 1990s. A multidisciplinary team drawn from three European museums has spent the last ten years subjecting the work to non-invasive imaging, pigment sampling, and the painstaking reconstruction of its provenance through wartime auction records.

The conclusion, as set out in a 240-page technical report released alongside the acquisition, is that the work was almost certainly painted in the early 1660s and was, the report's authors believe, subsequently abandoned. The attribution is not unanimous — two specialists consulted on the project have published separate notes of caution — but the museum considers it sufficiently robust to display the work as a Vermeer, with appropriate scholarly transparency.

"This is the rarest of arrivals," said the director, speaking in the museum's conservation studio. "A genuine addition to the corpus of an artist whose corpus is, by every measure, vanishingly small."

The painting will go on public view next spring as the centerpiece of a small thematic exhibition of Dutch interiors. Admission, the museum confirmed, will be free.