What should be the ratio of washer tank size to developer tank size?

• A. 3x
• B. 2x
• C. 4x
• D. 5x

Answer: (A)

The key idea is that washing needs to remove all residual developer from the film effectively. A washer tank that is significantly larger than the developer tank provides more wash solution to dilute and carry away the chemicals, and it allows better agitation so fresh water continually surrounds the film. This helps create a strong concentration gradient that pulls out residues and prevents them from affecting the next steps, keeping image quality consistent. If the washer is too small, residues can linger, leading to fogging, staining, or uneven development in the final image. So, using a washer that is clearly larger than the developer ensures the wash is thorough and reliable.