5.1.2: The Daguerreotype Era

Louis-Jacques-Mandé Daguerre: Inventor of the Daguerreotype

Louis-Jacques-Mandé Daguerre (1787–1851), pronounced loo-EE zhahk MAHN-day dah-GAIR, was a French artist, stage designer, and chemist who became one of the central figures in the invention of photography. Best known for developing the daguerreotype, the first widely used photographic process, Daguerre’s work transformed photography from an experimental curiosity into a public phenomenon. While often overshadowed in origin by his lesser-known partner, Joseph Nicéphore Niépce, it was Daguerre’s technical refinements, theatrical flair, and promotional skill that brought photography to the world stage.

Born in Cormeilles-en-Parisis, just outside Paris, Daguerre began his career as a draftsman and painter. By the 1820s, he had become a celebrated scenic designer in Paris, known especially for his innovations in stage lighting and illusion. His greatest success came with the invention of the diorama, a theatrical experience he launched in 1822 that used immense, hand-painted translucent canvases dramatically lit from various angles to simulate natural phenomena—avalanches, sunrises, and church interiors appeared to change in real-time before the audience’s eyes[i].

His work with light, projection, and illusion deeply informed his later approach to photography. The desire to capture such dramatic imagery with accuracy—without the need for painting every detail—fueled his interest in automated image-making.

In 1826, Daguerre began corresponding with optician Charles Chevalier about improving camera lenses, and by 1829 he learned of Joseph Nicéphore Niépce’s pioneering work using light-sensitive bitumen to create fixed images. That year, Daguerre entered a formal partnership with Niépce. Their agreement stated that both parties would share their methods and any future profits equally. Though Niépce had already succeeded in creating the first photographic image (View from the Window at Le Gras), his heliographic method was impractical—exposures were extremely long, and the images lacked detail[ii].

Daguerre and Niépce worked separately but corresponded regularly using a code to protect their discoveries. After Niépce’s death in 1833, Daguerre continued refining their process, shifting away from bitumen and experimenting with silver-plated copper and light-sensitive silver halides.

The Daguerreotype is Born

By 1835–1837, Daguerre had made a major breakthrough. He discovered that if a silver-coated copper plate, previously exposed to iodine vapor to form silver iodide, was developed not by further light exposure but by mercury vapor, a latent image would emerge. This chemical "development" reduced the exposure time significantly and revealed astonishingly detailed images. To make them permanent, Daguerre used a solution of salt (and later, sodium thiosulfate, as suggested by John Herschel) to fix the image and prevent it from darkening[iii].

Daguerre called the process the daguerreotype, and with the help of François Arago, a respected scientist and politician, the invention was presented to the Académie des Sciences in Paris on January 7, 1839. Arago successfully lobbied the French government to grant Daguerre and Niépce’s heir lifetime pensions in exchange for releasing the process to the public as a “gift to the world”[iv].

The announcement of the daguerreotype captivated Europe. Unlike Talbot’s paper-based calotype, which produced softer, grainier images, the daguerreotype’s fine detail and mirror-like surface stunned viewers. Although exposure times remained relatively long—initially around 10 to 30 minutes—they improved rapidly with technical refinement. Daguerre published a manual on the technique, and enterprising entrepreneurs quickly began establishing portrait studios across Europe and America.

One of the first publicly shared daguerreotypes, Boulevard du Temple (1838), shows a deserted Parisian street. The exposure was too long to capture the bustling traffic, but a single man—having held still long enough while getting his boots polished—became the first person to be photographed[v].

Despite his success, Daguerre made relatively few daguerreotypes himself after 1839. He retreated from public life, perhaps emotionally affected by a fire that destroyed his diorama theater and many of his early photographic experiments. He spent his later years in Bry-sur-Marne, where he died in 1851.

Daguerre’s invention did not remain dominant for long. The rise of paper negatives, reproducible prints, and eventually the wet collodion process made daguerreotypes technically obsolete within two decades. However, Daguerre’s achievement was pivotal—he gave the public its first true window into the photographic image, an optical miracle that merged chemistry, light, and mechanical precision.

His name is inscribed on the Eiffel Tower, and a lunar crater bears his name—a recognition of the man who, for a moment, harnessed the sun to paint the world.

The Daguerreotype Process: Capturing Light on a Silver Mirror

The daguerreotype, invented by Louis-Jacques-Mandé Daguerre and introduced to the public in 1839, was the first commercially successful photographic process. Its hallmark was its ability to render stunningly sharp and detailed images on a highly polished silver surface. Unlike paper-based processes of the time, the daguerreotype was a direct-positive method—each image was unique, recorded directly onto a metal plate without the use of a negative.

Step-by-Step Breakdown of the Daguerreotype Process[vi]

1. Polishing the Plate: The process began with a copper plate coated in a thin layer of pure silver. This plate was polished to a mirror-like finish using fine abrasives and increasingly soft cloths, often with the aid of rouge (iron oxide). A perfectly smooth surface was essential for capturing detail and achieving high reflectivity.
2. Sensitizing the Plate: The polished plate was placed in a light-tight sensitizing box and exposed to iodine vapor. The iodine reacted with the silver to form a thin layer of light-sensitive silver iodide. Later refinements to the process included additional exposures to bromine or chlorine vapors, which increased sensitivity and reduced exposure times.
3. Camera Exposure: Once sensitized, the plate was carefully inserted into a plate holder and placed in the camera obscura. Exposure times in the early days ranged from 10 to 30 minutes under bright sunlight, though this decreased significantly with improvements in chemistry and optics. The scene’s light struck the silver iodide layer, creating a latent image—an invisible impression that needed development to become visible.
4. Development with Mercury Vapor: The exposed plate was developed by placing it over a dish of heated mercury (approximately 75–80°C or 167–176°F). Mercury vapor bonded with the silver in the exposed areas, forming a white-silver amalgam. This revealed the latent image, now visible in exquisite detail.
5. Fixing the Image: To stop further light sensitivity, the developed image was immersed in a solution of either common salt (sodium chloride) or hyposulphite of soda (sodium thiosulfate), the latter of which was suggested by Sir John Herschel. This “fixed” the image by dissolving the unexposed silver iodide, stabilizing the plate.
6. Washing and Drying: The plate was thoroughly washed in distilled water and dried. Some daguerreotypists toned the image using gold chloride (a process called “gilding”), which enhanced contrast and improved permanence.
7. Sealing and Presentation: Because the image was extremely fragile and susceptible to abrasion, daguerreotypes were sealed behind glass with a protective mat and backing, often housed in ornate cases. The result resembled a miniature mirror that required viewing at a certain angle to fully see the image.

Boulevard du Temple: The First Photograph of a Human Being?

One of Daguerre’s most iconic daguerreotypes is Boulevard du Temple, made around 1838–1839. This image, captured from a window of his studio in Paris, shows a broad, tree-lined street in the Marais district of Paris.

The exposure time continues to be debated but was likely between 10 to 15 minutes, long enough that any movement—pedestrians, carriages, and street vendors—was too fleeting to be recorded. As a result, the street appears eerily empty, despite being one of the city’s busiest thoroughfares.

However, in the lower left corner of the plate, two figures remain: a man getting his boots polished and the bootblack himself. These two were the only ones who remained still long enough to leave a visible trace. The rest of bustling Paris evaporated in the long exposure. This accidental inclusion has been widely interpreted as the first known photograph of a human being[vii].

While some scholars have speculated that Daguerre posed these figures intentionally, no definitive evidence supports this theory. Regardless, Boulevard du Temple illustrates one of the central paradoxes of early photography: the camera’s ability to capture "truth" was dependent on stillness, making chance a powerful collaborator in the image-making process[viii].

The Unique Character of the Daguerreotype

• · Resolution: Daguerreotypes are capable of microscopic detail, with resolution estimated at over 1500 lines per inch.
• · Viewing Experience: They appear either as positives or negatives depending on the light and the angle of view. This made viewing them intimate and dynamic.
• · One-of-a-Kind: As a direct-positive process, no negative existed. Each plate was unique and could not be reproduced.

The Legacy of the Daguerreotype

The daguerreotype marked a profound turning point in the visual culture of the 19th century. When it was publicly announced in 1839, it was hailed as a marvel of modern science—“a mirror with a memory,” capable of capturing reality in unprecedented detail[ix]. Its finely resolved images, with their silvery, almost ethereal presence, stunned viewers and satisfied the Victorian appetite for realism and exactness[x]. Portrait studios sprang up rapidly across Europe and the United States, making likenesses available not just to the elite, but to the growing middle class[xi].

Yet for all its brilliance, the daguerreotype had limitations. Each image was unique, unreproducible, and required careful handling and presentation. The process also depended on hazardous chemicals such as mercury vapor, and exposure times—though reduced from earlier efforts—still demanded patient subjects and bright sunlight[xii]. As photographic practice expanded, so too did the desire for images that could be copied, shared, and archived—a medium not only of memory, but of mass communication.

It is precisely at this juncture—where the daguerreotype met its limits—that the work of William Henry Fox Talbot begins. While Daguerre gave the world its first permanent images, it would be Talbot who developed the foundation of modern photography: the negative/positive process that made photography infinitely reproducible[xiii].

We now turn to the quiet shores of Lake Como, where, in the frustration of a honeymoon sketcher, a new chapter in photographic invention was set in motion.