Methydroquinone is found in which solution?

• A. Developer solution
• B. Fixer solution
• C. Stop bath
• D. Washing bath

Answer: (A)

In film development, the chemical that actually creates the visible image sits in the developer solution. Methydroquinone is one of the developing agents used in this stage. Its job is to act as a reducing agent, donating electrons to the exposed silver halide crystals so they’re reduced to metallic silver. This builds up the dark areas of the negative where light exposure occurred, shaping the final image. The developer’s action is what differentiates it from the other processing steps.

By contrast, the fixer solution’s role is to dissolve any unexposed silver halide and iron out the unneeded silver salts, the stop bath neutralizes the alkaline developer to halt development, and the washing bath rinses away residual chemicals. So methydroquinone is found in the developer because that’s where the chemical reactions that form the image actually take place.