Lost film

A lost film is a feature or short film in which the original negative or copies are not known to exist in any studio archive, private collection, or public archive. Films can be wholly or partially lost for a number of reasons. Early films were not thought to have value beyond their theatrical run, so many were discarded afterward. Nitrate film used in early pictures was highly flammable and susceptible to degradation. The Library of Congress began acquiring copies of American films in 1909, but not all were kept. Due to improvements in film technology and recordkeeping, few films produced in the 1950s or beyond have been lost.

Rarely, but occasionally, films classified as lost are found in an uncataloged or miscataloged archive or private collection, becoming "rediscovered films".

Conditions

During most of the 20th century, American copyright law required at least one copy of every American film to be deposited at the Library of Congress at the time of copyright registration. However, the Librarian of Congress was not required to retain those copies: "Under the provisions of the act of March 4, 1909, authority is granted for the return to the claimant of copyright of such copyright deposits as are not required by the Library."

A report by Library of Congress film historian and archivist David Pierce estimates that:

around 75% of original silent-era films have perished;
14% of the 10,919 silent films released by major studios exist in their original 35 mm or other formats;
11% survive only in full-length foreign versions or film formats of lesser image quality.

Of the American sound films made from 1927 to 1950, an estimated half have been lost.
The phrase "lost film" can also be used for instances where footage of deleted scenes, unedited, and alternative versions of feature films are known to have been created but can no longer be accounted for. Sometimes, a copy of a lost film is rediscovered. A film that has not been recovered in its entirety is called a partially lost film. For example, the 1922 film Sherlock Holmes was considered
lost but eventually rediscovered with some of the original footage missing.

Stills

Many film studios hired a still photographer to take pictures during production for potential publicity use. Some are produced in quantity for display use by theaters, others in smaller numbers for distribution to newspapers and magazines, and have subsequently preserved imagery from otherwise lost films.
In some cases, such as London After Midnight, the surviving coverage is so extensive that an entire lost film can be reconstructed scene by scene from still photographs. Stills have been used to stand in for missing footage when making new preservation prints of partially lost films: for example, with the Gloria Swanson picture Sadie Thompson.

Reasons for film loss

Most lost films originate from the silent film and early talkie era, from about 1894 to 1930. Martin Scorsese's Film Foundation estimates that more than 90% of American films produced before 1929 are lost, and the Library of Congress estimates that 75% of all silent films are lost forever.
The largest cause of silent-film loss is intentional destruction. Before the eras of home cinema, television and home video, films were considered to have little future value when their theatrical runs ended. Similarly, silent films were perceived as worthless after the end of the silent era. Film preservationist Robert A. Harris has said, "Most of the early films did not survive because of wholesale junking by the studios. There was no thought of ever saving these films. They simply needed vault space and the materials were expensive to house." The studios could earn money by recycling film for its silver content. Many Technicolor two-color negatives from the 1920s and 1930s were discarded when studios simply refused to reclaim their films, still being held by Technicolor in its vaults. Some used prints were sold to scrap dealers and ultimately edited into short segments for use with small, hand-cranked 35 mm movie projectors, which were sold as a toy for showing brief excerpts from Hollywood films at home.
File:Tenderloin poster.jpg|thumb|right|Tenderloin, starring Dolores Costello, the second Vitaphone feature to have talking sequences, is considered a lost film because only its soundtrack is known to have survived.
Many other early motion pictures are lost because the nitrate film employed for nearly all 35 mm negatives and prints created before 1952 were highly flammable unless carefully conditioned and handled. When in very badly deteriorated condition and improperly stored, nitrate film can spontaneously combust. Fires have destroyed entire archives of films, such as the 1937 storage-vault fire that destroyed all the original negatives of pre-1935 films made by Fox Pictures and the 1965 MGM vault fire that destroyed hundreds of silent films and early talkies, including London After Midnight, now considered among the greatest of all lost films. Eastman Kodak introduced a nonflammable 35 mm film stock in 1909; however, the plasticizers employed to increase the film's flexibility evaporated too quickly, rendering the film dry and brittle and causing splices to separate and perforations to tear. By 1911, the major American film studios had reverted to nitrate stock. "Safety film" was relegated to sub-35 mm formats such as 16 mm and 8 mm until improvements were made in the late 1940s.
Nitrate film is also chemically unstable and over time can decay into a sticky mass or a powder akin to gunpowder. This process can be very unpredictable; some nitrate film from the 1890s is still in good condition, while some much later nitrate film was scrapped as unsalvageable at barely 20 years old. Much depends on the environment in which the film is stored. Ideal conditions of low temperature, low humidity and adequate ventilation can preserve nitrate film for centuries, but in practice, storage conditions have usually fallen far below this level. When a film on nitrate base is said to have been "preserved", this almost always means simply that it has been copied onto safety film or, more recently, digitized, but both methods result in some loss of quality.
File:GoldDiggersBroadway2.jpg|thumb|Gold Diggers of Broadway, the third Warner Bros. film shot in Technicolor, is a "partially lost film".
Some pre-1931 sound films produced by Warner Bros. and First National have been lost because they used a sound-on-disc system with a separate soundtrack on special phonograph records. In the 1950s, when 16 mm sound-on-film reduction prints of early talkies were produced for television syndication, such films without complete soundtrack discs were at risk of permanent loss. Many sound-on-disc films have survived only by way of these 16 mm prints.
As a consequence of this widespread lack of care, the work of many early filmmakers and performers exists in the present day only in fragmentary form. A high-profile example is the case of Theda Bara, one of the most famous actresses of the early silent era. Bara appeared in 40 films, but only six are now known to exist. Clara Bow was equally celebrated in her heyday, but 20 of her 57 films are completely lost, and another five are incomplete. Once-popular stage actresses who transitioned to silent films, such as Pauline Frederick and Elsie Ferguson, have little left of their film performances. Fewer than ten movies exist from Frederick's work from 1915 to 1928, and Ferguson has two surviving films, one from 1919 and the other from 1930, her only talkie. All of the film performances of the stage actress and Bara rival Valeska Suratt have been lost. Most of the starring performances of Katherine MacDonald are gone save for a couple of costar appearances. All of George Walsh's Fox appearances have disappeared. Only three of the films of Fox's William Farnum, an early screen Western star, have survived. Others, such as Francis X. Bushman and William Desmond, accumulated numerous film credits, but films produced in their heyday are missing because of junking, neglect, warfare or the demise of their studios. However, unlike Suratt and Bara, because Bushman and Desmond continued working into the sound era and even on television, their later performances survive.
Films were sometimes destroyed deliberately. In 1921, actor Roscoe "Fatty" Arbuckle was charged with the murder of actress Virginia Rappe. Following a series of trials, he was ultimately acquitted, but not before his name had become so toxic that studios engaged in the systematic destruction of all films in which he had a starring role. The Charlie Chaplin-produced A Woman of the Sea was destroyed by Chaplin himself as a tax write-off.
File:Oregon trailposter.jpg|thumb|right|John Wayne in the lost Western The Oregon Trail
In contrast, the filmography of D. W. Griffith is nearly complete, as many of his early Biograph films were deposited by the company in paper print form at the Library of Congress. Many of Griffith's feature-film works of the 1910s and 1920s were added to the film collection at the Museum of Modern Art in the 1930s and were preserved under the auspices of curator Iris Barry. Mary Pickford's filmography is nearly complete. Her early years were spent with Griffith, and she gained control of her own productions in the late 1910s and early 1920s. She had originally intended to destroy these films but later relented. She also recovered as many of her Zukor-controlled early Famous Players films as were salvageable. Western star William S. Hart, an influence on such later filmmakers as Akira Kurosawa, has a tremendous amount of surviving feature work with only a few lost films. Likewise, almost all of the films created by Charlie Chaplin have survived, as well as extensive amounts of unused footage dating back to 1916; the exceptions are the aforementioned A Woman of the Sea and one of his early Keystone films, Her Friend the Bandit. Stars such as Chaplin and Douglas Fairbanks benefited from their great popularity: because their films were repeatedly reissued throughout the silent era, surviving prints could be found even decades later. Pickford, Chaplin, Harold Lloyd and Cecil B. DeMille were early champions of film preservation, although Lloyd lost a large number of his silent works to a vault fire in the early 1940s.
In March 2019, the National Film Archive of India reported that 31,000 of its film reels had been lost or destroyed.