Copper is used in the Bodian impregnating solution to increase the differentiation between neural and connective tissues.

• A. True
• B. False
• C. Copper is not used in Bodian
• D. Copper decreases differentiation

Answer: (A)

Copper in the Bodian impregnating solution helps the silver deposit selectively in neural elements, increasing contrast between neural tissue and surrounding connective tissue. The copper acts as a catalyst or catalyst-like component during the silver impregnation and development steps, promoting more robust staining of axons and nerve fibers while reducing background staining in connective tissue. As a result, neural elements appear distinctly dark against a lighter, less stained matrix, making differentiation easier. Without copper, the background can be less controlled and the nerve fibers less clearly defined.