Introduction to Darkroom techniques

• A. Red ✓
• B. Amber
• C. Green
• D. Blue

Why: Red safelights emit long wavelengths that black-and-white silver gelatin papers are relatively insensitive to, making red the traditional safest choice for general darkroom work.

• A. It will make the chemicals more expensive to use
• B. It can produce toxic gases and ruin the chemistry ✓
• C. It will cause the paper to fog immediately
• D. It changes the color of the safelight

Why: Many darkroom chemicals react dangerously when combined, potentially releasing toxic fumes and neutralizing their photographic properties, so each must be kept separate.

• A. Ignore it until the end of the session
• B. Wipe it up with paper towels and throw them in the trash immediately
• C. Rinse it with water and clean it up promptly using appropriate absorbent materials ✓
• D. Cover it with a towel and leave it to dry

Why: Spills should be cleaned promptly with water and absorbent materials to prevent slips, contamination, and exposure, and dried residues can be hazardous.

• A. It keeps the paper from curling
• B. It helps reduce inhalation of chemical vapors from solutions ✓
• C. It makes the safelight brighter
• D. It speeds up the development process

Why: Chemical solutions, especially stop baths and some developers, can release vapors, and adequate ventilation reduces the risk of inhaling them.

• A. Pour them down any drain without treatment
• B. Mix them together to save space
• C. Follow local regulations, which often require collection or special disposal of silver-containing fixer ✓
• D. Leave them in open containers to evaporate

Why: Used fixer contains dissolved silver and other pollutants, so local environmental regulations usually require proper collection or recycling rather than ordinary drain disposal.

• A. Darkness keeps the film cool and prevents chemical drying
• B. Ambient light would expose the light-sensitive emulsion and fog the film ✓
• C. Darkness is required to activate the film's developer
• D. Light causes the film base to warp during loading

Why: Film emulsion contains silver halide crystals that react to light. Any stray light reaching the film before development exposes it, producing fogging or unwanted images.

• A. Medium format roll film (120)
• B. Large format sheet film
• C. 135 cartridge film in a light-tight canister ✓
• D. Instant peel-apart film

Why: 35mm cameras use 135 film, supplied in a light-tight metal or plastic cassette that is loaded into the camera body and advanced across the film gate.

• A. Cutting the film into strips for developing
• B. Pulling the film tongue out of the cassette and threading it onto the take-up spool ✓
• C. Rewinding the film fully back into the cassette
• D. Setting the ISO on the film canister

Why: Leadering means drawing the film leader out of the cassette until it engages with the take-up spool, so the film can be wound across the film gate as frames are shot.

• A. To confirm the shutter speed is calibrated
• B. To ensure the sprocket holes are engaging the teeth and the film is not stuck or slipping ✓
• C. To adjust the aperture ring
• D. To check whether the film has expired

Why: If the sprockets are not engaging properly, the film may not advance, leading to multiple exposures on the same frame or blank frames. Checking the advance wheel or counter after the first shots catches this early.

• A. It measures the exposure time for each shot
• B. It tracks how many exposures remain on the roll so you know when to rewind ✓
• C. It controls the film's ISO sensitivity
• D. It records the GPS location of each photo

Why: The frame counter indicates how many exposures have been made, helping you know when the roll is finished so you can rewind the film into the cassette before opening the back.

• A. To fix the image permanently so it no longer responds to light
• B. To convert the latent image formed by light exposure into a visible silver image ✓
• C. To remove unexposed silver halide crystals from the emulsion
• D. To harden the gelatin layer so it resists scratches

Why: Light exposure creates a latent image in the silver halide crystals. The developer chemically reduces the exposed crystals to metallic silver, making the image visible.

• A. It adds contrast to the negative
• B. It washes away the latent image
• C. It halts development quickly and extends the life of the fixer ✓
• D. It softens the film base for easier drying

Why: The acidic stop bath immediately neutralizes the alkaline developer, stopping development precisely. This prevents developer carryover from exhausting the fixer early.

• A. It develops any remaining latent image
• B. It removes unexposed silver halide so the image no longer darkens in light ✓
• C. It increases the film speed
• D. It adds color dyes to the negative

Why: Fixer dissolves the unexposed and undeveloped silver halide crystals. Without fixing, the film would continue to darken when exposed to light.

• A. It decreases contrast and reduces grain
• B. It increases contrast and density of the negative ✓
• C. It has no effect on the negative's density
• D. It shifts the film's color balance

Why: Longer development allows more silver halide to be reduced, producing denser negatives with higher contrast. This is the basis of push and pull processing.

• A. To remove air bubbles from the emulsion
• B. To ensure fresh developer contacts all areas of the film evenly ✓
• C. To speed up the chemical reaction to a fixed time
• D. To prevent the film from curling in the tank

Why: Agitation replenishes fresh developer at the film surface and removes exhausted solution. Inconsistent agitation causes uneven development, visible as streaks or patches.

• A. To enlarge a single negative to a full-size print
• B. To view all frames from a roll of film at once at actual size ✓
• C. To permanently store negatives in an archival sleeve
• D. To correct exposure errors in the original negatives

Why: A contact sheet is made by placing the negatives directly on photographic paper and exposing them together, producing a same-size positive image of every frame on the roll so the photographer can evaluate and select shots before making enlargements.

• A. This prevents the negatives from scratching the enlarger lens
• B. This ensures the emulsion of the negative sits in direct contact with the paper's emulsion, producing the sharpest image ✓
• C. This keeps the film base from reflecting stray light
• D. This makes the image appear reversed so it reads correctly on the paper

Why: Placing the emulsion side in direct contact with the photo paper minimizes the gap between them, which keeps the image sharp, since any space between them causes blurring.

• A. A color-corrected tungsten bulb in an enlarger head
• B. A diffused white light source such as an enlarger head or a dedicated contact printer light ✓
• C. Direct sunlight through a window
• D. An infrared heat lamp

Why: A diffused, even light source ensures uniform exposure across all frames. Enlargers or dedicated contact printers are standard tools for this, while direct sunlight would be uneven and uncontrollable.

• A. Around 0.5 seconds
• B. Around 5 to 10 seconds ✓
• C. Around 2 minutes
• D. Around 30 minutes

Why: Test strips determine exact timing, but a contact sheet usually starts around 5 to 10 seconds at a moderate aperture like f/8 with standard enlarger output. Too short underexposes and too long washes out the highlights.

• A. Fix, develop, stop, wash
• B. Develop, stop, fix, wash ✓
• C. Stop, develop, wash, fix
• D. Wash, fix, develop, stop

Why: The standard black-and-white sequence is develop to form the image, stop bath to halt development, fix to remove unexposed silver halides, and then wash to remove chemicals and preserve the print.

• A. To check whether the negative is scratched or damaged before printing
• B. To determine the correct exposure time by exposing different segments of a single sheet of paper to varying durations
• C. To align the negative carrier with the easel borders
• D. To measure the color temperature of the enlarger lamp

• A. Use a loupe or focusing magnifier on the projected image at the easel, adjusting the enlarger head height or lens focus until grain or edges are sharp
• B. Open the lens to its widest aperture and leave it there for the final print
• C. Place a sheet of white paper directly on the negative carrier to focus
• D. Turn off the safelight and focus using only the room lights

• A. Stopping down increases the enlarger's brightness so exposures are shorter
• B. Stopping down improves sharpness and depth of field across the print, since most enlarger lenses perform best a few stops from maximum aperture
• C. Wide apertures damage the photographic paper
• D. Wide apertures cause the negative to heat and warp

• A. Expose the full print for 8 seconds, since the test strip result applies directly at the same aperture
• B. Expose the full print for 16 seconds, because test strips are always underexposed
• C. Expose for 4 seconds, because test strips are always overexposed
• D. Repeat the test strip with a different negative before making any print

• A. Leave photographic paper exposed under the safelight until the print is ready to develop
• B. Keep unexposed paper in its light-tight box, work under the appropriate safelight, and never turn on white room lights while paper is out
• C. Use the enlarger lamp as a substitute for the safelight
• D. Handle paper with bare hands dipped in developer to keep it moist

• A. To increase the overall contrast of the entire print
• B. To lighten specific areas of the print by blocking light from reaching them for part of the exposure ✓
• C. To darken specific areas of the print by adding extra light to them
• D. To fix the print's developer temperature

Why: Dodging involves shielding a portion of the print from the enlarger light during exposure, so those areas receive less exposure and appear lighter in the final print.

• A. A dodging tool made of wire and cloth
• B. A piece of card with a hole cut in it, used to let extra light fall on one area ✓
• C. A squeegee
• D. A safelight filter

Why: Burning is performed by giving a localized area extra exposure, often using a card with a cutout or a hand shaped to let light fall only where needed.

• A. Expose a strip of paper at several different exposure times across one sheet ✓
• B. Develop an entire sheet without exposing it first
• C. Print the negative on film instead of paper
• D. Expose the paper for ten minutes at maximum brightness

Why: A test strip exposes segments of one sheet at different times, letting you judge which exposure time gives the best density and contrast before committing to a full print.

• A. Increase the exposure time
• B. Decrease the exposure time ✓
• C. Replace the developer with water
• D. Move the enlarger closer to the paper without changing anything else

Why: A print that is too dark has received too much light, so reducing the exposure time is the most direct correction. Moving the enlarger closer would actually increase the light intensity and make things darker.

• A. Because the paper cannot be developed once it has been dodged
• B. Because light must reach the paper while the image is being formed, so selective shading and extra light must be applied during exposure ✓
• C. Because the chemistry only works in complete darkness
• D. Because the negative becomes unusable after developing

Why: The latent image is created by light striking the paper during exposure, so local lightening and darkening must be controlled at that stage. Afterward, the image is already chemically fixed in its tonal values.

• A. To add contrast to the image
• B. To remove unexposed silver halide so the image is no longer light-sensitive ✓
• C. To harden the emulsion for drying
• D. To neutralize the developer's alkalinity

Why: Fixer dissolves the unexposed, undeveloped silver halide crystals, making the print stable under room light. Without fixing, the remaining silver halide would continue to darken when exposed to light.

• A. Potassium bromide
• B. Sodium thiosulfate (hypo) ✓
• C. Acetic acid
• D. Sodium carbonate

Why: Sodium thiosulfate, commonly called hypo, forms soluble complexes with silver halides, removing them from the paper or film. Potassium bromide is a restrainer used in developers, acetic acid is in stop baths, and sodium carbonate is an alkaline developer activator.

• A. It washes away excess silver
• B. It halts development quickly and protects the fixer from contamination by developer ✓
• C. It hardens the gelatin layer
• D. It restores exposure detail in the highlights

Why: The acidic stop bath immediately neutralizes the alkaline developer, preventing further development and extending the life of the fixer, which loses effectiveness when contaminated with developer.

• A. To remove residual fixer chemicals that would otherwise cause yellowing and staining over time ✓
• B. To increase the print's glossiness
• C. To reactivate unexposed silver
• D. To cool the print before drying

Why: Residual thiosulfate and its silver complexes can react with the image silver over time, causing yellowing, staining, and print deterioration. Thorough washing removes these compounds for archival permanence.

• A. Hanging it by one corner in direct sunlight
• B. Placing it face-down on a hot dryer surface
• C. Air-drying flat on a screen or blotting between dry sheets, then pressing if needed ✓
• D. Rolling it tightly in a towel to speed drying

Why: Air-drying flat on a screen or between blotters avoids curling and heat damage. Direct sun can fade or warp prints, and heat or rolling can cause cracking, curl, or emulsion damage, especially on fiber-based paper.