A collagen-staining modification uses which color to highlight collagen?

• A. Green
• B. Blue
• C. Red
• D. Yellow

Answer: (A)

Color coding in collagen staining strategies helps differentiate connective tissue from muscle and other tissue elements. In the collagen-staining modification described, collagen fibers reveal themselves as green, providing a clear contrast against the red-stained cytoplasm and muscle with dark, stained nuclei. This green highlight makes it easier to assess collagen distribution and quantity, such as when evaluating fibrosis or scar tissue. While other staining variants may color collagen blue or pink depending on the protocol, green is the color associated with this particular modification.