What is photographic paper and how does it work?

Photographic paper is a paper coated with a light-sensitive chemical formula, primarily gelatin silver, used to create physical photographic prints. When exposed to light via a negative, digital printer, or contact method, it captures a latent image that is subsequently developed, fixed, and cleared into a permanent visible photograph. Despite the rise of digital photography, it continues to be manufactured in various sizes, weights, and surface finishes.

What we know

• Photographic paper is coated with a light-sensitive chemical, most commonly gelatin silver, which functions similarly to photographic film. [1, 2]
• The print image is traditionally produced by interposing a photographic negative between a light source and the paper, either through direct contact or projection via an enlarger. [2, 3, 5]
• Exposure to light creates an invisible latent image on the paper, which requires chemical processing to be revealed, made permanent, and rendered insensitive to light. [2, 4, 5]
• Photographic papers are still sold commercially today and come in numerous standard sizes, weights, surface finishes, and varying emulsions. [2]

Where to go next

• how it workedHow does photographic processing develop latent images?
• the bigger pictureWhat is photographic printing?
• how we knowHow does photography record light?
• compared withWhat are digital printers like LightJet?
• a case in pointHow do instant films like Polaroid work?
• an unexpected connectionHow does manufacturing utilize light-sensitive materials?Light-sensitive chemistry is not just used for artistic photography, but also for manufacturing processes like photolithography.

Sources

• [1]photographic paper (Wikidata Q912760) · CC0 1.0
• [2]Photographic paper · CC BY-SA 4.0
• [3]Photographic printing · CC BY-SA 4.0
• [4]Photographic processing · CC BY-SA 4.0
• [5]Photography · CC BY-SA 4.0