Which temperature is appropriate for standard film development in Celsius?

• A. 15C
• B. 25C
• C. 20C
• D. 10C

Answer: (C)

Consistent processing temperature controls how fast the developer works and how the reaction products diffuse, which directly affects development time, contrast, and image quality. The standard temperature for film development is 20°C. At this temperature, developer activity yields predictable, balanced results and most instructions assume it, making results reproducible across films and batches. If the temperature is higher, development happens faster and can increase contrast or cause overdevelopment; if cooler, development slows and can lead to underdevelopment or uneven results, requiring time adjustments. That’s why 20°C serves as the practical reference point for standard film development.