Verde y Negro presents three lithographs unified by Herrera's signature hard-edge geometry, rendered in the stark, declarative pairing of green and black that she made her own over a decades-long career. Produced in 2017 at Universal Limited Art Editions, each sheet measures 54 by 44.5 centimeters, a scale that concentrates the visual tension between precisely delineated planes into a compact, forceful encounter. The compositions distill Herrera's lifelong preoccupation with equilibrium and opposition, where color functions not as decoration but as structural force, and every edge carries the same resolute clarity that defines her paintings. At the time of this portfolio's creation, Herrera had achieved long-overdue international recognition, with major institutional retrospectives cementing her reputation as one of the most rigorous practitioners of geometric abstraction of the twentieth and twenty-first centuries. The lithographic medium suits her sensibility remarkably well, allowing the flatness and chromatic saturation her work demands while introducing the subtle material warmth of ink on paper. The edition of twenty ensures genuine rarity, and each impression is hand-signed by the artist, adding personal authentication to works that already carry considerable art-historical weight. For collectors, Verde y Negro represents an accessible point of entry into an oeuvre that commands significant prices at the highest levels of the market. The portfolio holds together beautifully as a triptych, offering flexibility for display across multiple rooms or as a considered group installation. Condition, edition size, and provenance from a printer of ULAE's standing combine to make this a holding with both immediate aesthetic impact and long-term collectible significance.