Seni, a club owner, is under pressure by a rival, Wan, to pay an outstanding loan. Upon hearing that he has a long-lost brother named Sema, Seni sends his loyal lieutenants, Tom and Pon, to visit Sema, only to find that Sema has died. Seni decides that he can use the situation to his advantage, and buries Sema's body in a forest.
Seni and Tom orchestrate the death of Wan, by setting fire to Wan's car, pushing it off a cliff and framing Wan's assistant Sin, also dead, for the murder. Seni then assumes the identity of his dead brother, free and clear of debts and Wan's meddling.
Tom, meanwhile, has fallen in love with Phrae, a widowed mother who has worn black silk since her husband died two years before. Seni sees Phrae as a threat to his scheme and orders Tom to stop seeing her. Wan further plots to use Tom to psychologically manipulate Phrae.
Phrae then leaves Tom, shaves her head and enters a Buddhist temple. Tom tries to stand up to his boss, with disastrous consequences.Ratanavadi Ratanabhand as Phrae
Senee Wisaneesarn as Senee/Sema
Tom Wisawachart as Tom
Black Silk was the second color film made by Rattana, shot in the Cinemascope format at a time when most other Thai filmmakers were using 16-mm film.
With most of his resources put into the film stock and equipment, Rattana made sacrifices, performing most of the key jobs himself as writer, director, producer, cinematographer and editor. His daughter, Pannee Trangkasombat (using the stage name Ratanavadi Ratanabhand) was cast as Prae.
The sets are very basic, and the fight sequences were made with no sound effects. Nonetheless, the performances are praised as generally good, especially Senee Wisaneesarn as Senee/Sema. There are even some musical numbers.
Black Silk was a landmark of Thai cinema, being among the first Thai films to be chosen for a major international film festival, in competition at the 11th Berlin International Film Festival in 1961.
In the 2000s, the film was featured in retrospective programs at the Bangkok International Film Festival, the Singapore International Film Festival and the 2005 Pusan International Film Festival.