In 1950, the photographer Gisèle Freund embarked on what she believed would be a two-week visit to Mexico. As it turned out, she wouldn’t leave the country until two years later. There she met Frida Kahlo and Diego Rivera, who welcomed Freund into their home in Coyoacán, Mexico City. In the following years, Freund immersed herself in the couple’s daily life, taking hundreds of photographs of the artists at work and in their private moments. The vivid, intimate portraits are some of the latest that exist of Kahlo: She was very ill for the last years of her life, suffering from gangrene, and died in 1954, at age 47. This month, a new book, Frida Kahlo: The Gisèle Freund Photographs, showcases over a hundred of Freund’s rare images of the legendary artists — many of which have never been published before — alongside text by Gerard de Cortanze, Lorraine Audric, and Freund herself.