How often should developer solution be replaced?

• A. every 1 month
• B. every 3 months
• C. every 6 months
• D. every 12 months

Answer: (B)

Maintaining fresh developer solution is essential for reliable film development. Over time the chemical degrades and becomes contaminated with by‑products, fixer carryover, dust, and microbes, which reduces development activity and can cause lower contrast, fogging, or uneven densities. Replacing or refreshing the developer on a scheduled basis helps keep image quality consistent while avoiding waste from unnecessary frequent changes. A three‑month interval is a common compromise for typical workloads because it keeps the chemistry effective without incurring excessive downtime or cost. Replacing every month is more frequent than needed for normal use, while waiting six or twelve months increases the risk of degraded development and poorer image quality. So, the recommended replacement interval is every three months.