What John Singer Sargent Saw

Perhaps you, too, know the notorious “Madame X”? She of the aquiline profile, alabaster skin and plunging black neckline has recently been transported to Tate Britain, in London, for the second stop of “Sargent and Fashion” (through July 7), which debuted at the Museum of Fine Art, Boston, last fall. The retrospective brings together over…

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