Lorenzo Homar (San Juan, 1913–2004) met Pedro Alcántara (Cali, b. 1942) while he was in San Juan for his exhibition at the Galería El Morro (Dibujos y monotipos [Drawings and Monotypes], December 4, 1970), and for the Primera Bienal de San Juan del Grabado Latinoamericano [First San Juan Biennial of Latin American Prints] (1970). Alcántara later spent some time at Homar’s workshop, where he began producing silkscreen prints, and the two artists became close friends. In 1972, the directors of the Museo La Tertulia in Cali, Colombia, invited Homar to teach a course on silkscreen printing to a group of local artists. The workshop lasted ten days, during which time Pedro Alcántara, Enrique Grau, and Phanor León created the silkscreens that were included in the portfolio produced by Cartón de Colombia that year. Alcántara then began to develop plans to establish a permanent workshop under Homar’s guidance. Homar returned to Cali in 1976 to oversee the printing of the portfolio “Primera colección de grabado” [First Print Collection], published by the Graphic Arts Workshop of the MA [Museum of Modern Art], La Tertulia. On August 23, 1974, Alcántara exhibited a collection of prints, created between 1964 and 1974, at the Museo de Grabado Latinoamericano [Museum of Latin American Prints] at the Instituto de Cultura Puertorriqueña [Puerto Rican Cultural Institute]. Homar designed and printed the poster for the show.