Collection Anthony d’Offay, London, courtesy of Hedges Projects, Los Angeles.Recently, Pat Hackett, a New York-based writer and editor, opened an unassuming three-ring binder in her Gramercy Park apartment and discovered 83 unpublished photographs by Andy Warhol. The images — which depict, among other subjects, Brooke Shields, Muhammad Ali, Farrah Fawcett, Jean-Michel Basquiat and Warhol’s two pet dachshunds, Archie and Amos, seated with Lou Reed — had been gifted to Hackett by Warhol not long before his death, in 1987, and had not left her home since. Hackett was one of Warhol’s frequent collaborators and confidantes; she contributed to Interview, co-wrote his final film, “BAD” (1987), and later edited his posthumously published “Diaries” (1989). While working on another project, Warhol’s arch entertaining manual “The Party Book” (1988), she took home a selection of the artist’s photographs — casual portraits of friends and vivid snapshots of New York nightlife — to review as possible illustrations. “A few days later, when I mentioned that I would bring them back soon, he said, ‘Oh you don’t have to.’ He’d noticed how much I loved them,” recalls Hackett.The previously unpublished and unexhibited images, which will go on show for the first time on May 3 at Hedges Projects in Los Angeles, are all one-of-a-kind silver gelatin prints that capture their subjects in stark black and white. “Oddly, as much as Andy is known as ‘the master colorist,’ there is a whole powerful, primitive area of his work that was exclusively black and white,” says Hackett.