Darkroom Maintenance and Management

Darkroom Overview

  • Scientific laboratory for radiography processes.

Objectives

  • Knowledge & skills to maintain darkroom and manual processing equipment.

  • Perform manual film processing and implement quality control.

Equipment in Darkroom

  • Film processing tanks, drying rack, hangers, safelight.

Darkroom Disease

  • Hypersensitivity to fumes; fundamental function: protect film from white light and radiation exposure.

Importance of Processing Room

  1. Location: Near exposure room and adequate storage.

  2. Size: Minimum 15ft x 9.5ft, wet and dry sections must be separated.

  3. Radiation Protection: Walls must be concrete, hollow blocks, or protected by lead.

  4. Ventilation: 8-10 air changes/hour, maintain appropriate temperature (20-24 °C) and humidity (30-60%).

  5. Cleanliness: Avoid smoking, eating, or drinking to prevent artifacts.

  6. Light-tight Entrance: Various designs to prevent light leakage.

  7. Illumination: Proper safelighting conditions to avoid film fogging.

  8. Wall Colors: Use pastel/light colors; matte finish.

  9. Electrical Wiring: Should be installed safely.

Darkroom Requirements

  • No white light entry.

  • Adequate ventilation, drainage, and water supply.

  • Maintain temperature, humidity, and cleanliness.

Testing Methods

  1. White Light Leakage Test: Every 6 months; check for leaks.

  2. White Light Fogging Test: Check fogging effects by exposing film.

  3. Safelight Efficiency Test: Determine safe exposure time.

  4. Developer Activity Test: Daily checks on developer's effectiveness.

  5. Development Time Test: To establish suitable development durations.