Twilight in the Wilderness” (1860), by Frederic Edwin Church, with a replacement mid-19th-century frame. Frederic Edwin Church/The Cleveland Museum of Art

 

Mr. Wilner is also sponsoring a competition in which he will frame five works of 18th-to-mid-20th-century American art free. He expects to receive about 50 entries from museums by the June 15 deadline.

Finally, the new emphasis on historically accurate frames raises fascinating, if unsettling, questions. As frames shape the viewing experience, have the millions who have stood awe

struck in front of Impressionist paintings and other masterworks through the years never, in fact, seen them properly? Has their appreciation of these beloved paintings been askew, tainted or incomplete?

Ms. Easton of the Center for Curatorial Leadership said that those provocative puzzles go with the territory. “In some ways, a painting never looks more beautiful than when it is on its easel, and the artist takes his brush away for the last time. And the frame is part of leaving that moment.”

For a van Gogh, a $48,000 Frame

Vincent van Gogh completed his work on “Landscape Under a Stormy Sky” in the late 1880s. , Recently Felix Terran has been carving a frame for the painting, expected to fetch $50 million to $70 million at Sotheby’s this year.

Bent over a rod of bass wood, he used one and then another of the scores of chisels laid out before him to create a teardrop-shaped curve. Over the next few days, he would carve several hundred of these delicate gadroons to replicate the Museum of Modern Art frame in which nestles van Gogh’s “Starry Night.”

As Mr. Terran sculpted the wood, four other craftsmen at Eli Wilner & Company’s workshop in Long Island City, Queens, were preparing to do their part to build this single frame. They would create molds for the ornaments that adorn the frame; painstakingly apply gesso, an easily sanded paint mixture; and then add various types of gold, finish and inks. The frame would require about 200 hours of labor and cost about $48,000.

The craftsmanship required to build the van Gogh frame embodies the synergistic relationship between classic art and modern science that informs the growing movement to replicate and restore historic frames.

The handful of experts in the United States and Europe who perform this rarefied work have spent decades mastering the craft. “We’ve learned how to be the best frame fakers in the world,” Eli Wilner said.

“Those fakes, however, often require more work than the originals, because while they must be historically accurately, they cannot in most cases gleam with newborn luster,” he said.

To achieve effects satisfying to the modern eye, frame makers must not only master antiquated materials and techniques used during specific periods, but they must also account for the ravages of time. If they succeed, museumgoers and collectors will barely notice their work.