Film lines or spots {blip}| can be for timing or counting.
A hot smooth metal plate {ferrotype}| pressed against paper emulsion can make glossy paper, or dark enameled metal can create a direct positive image.
Emulsions {film}| can contain silver-compound molecules.
camera
Light enters camera lens and focuses on film. Black-and-white film has silver bromide or silver iodide crystal emulsion embedded in cellulose acetate. Light separates silver from silver bromide, to make latent image. People remove film from camera in the dark.
develop
Chemical treatment {developer, film treatment} makes actual image. Developer chemicals liberate more silver around silver already present, to bring out image. Chemical treatment {fixer, film treatment} {hypo} sets image permanently {negative film} in transparent reverse image. Fixer washes away remaining silver bromide, so film cannot change anymore if exposed to more light.
printing
Passing light through negative and lenses {enlarger, photography} can make a larger print {positive film}. Print paper has silver bromide crystals in gelatin {emulsion, film}. Print paper develops and fixes. Negative can be directly on top of print paper and have direct exposure to light {contact printing, film}.
transparency
Transparent negatives {slide, film} {transparency, film} can be for projection.
color
Color film has three layers, one for red, one for blue, and one for green. Layers have dyes to filter out other colors.
instant
Instant picture cameras {Polaroid camera} transfer negative to positive by pressing both together to release chemicals.
non-glossy surface {matte, surface}|.
Film can display all colors {panchromatic}|.
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Date Modified: 2022.0225