The crystal violet stain for amyloid is which type of stain?

• A. Monochromatic
• B. Polychromatic
• C. Fluorescent
• D. Acid-fast

Answer: (B)

The key idea here is how the stain presents color. A crystal violet stain used for amyloid is considered polychromatic because the protocol involves more than one color-containing step—often a counterstain or additional dye—so the tissue displays multiple colors. This color variety helps distinguish amyloid deposits from surrounding structures.

Monochromatic staining would produce only a single color for the stained components, which isn’t the case here. Acid-fast staining refers to a different, specialized method for certain organisms and uses a distinct color pattern, while fluorescent staining relies on fluorescence under specific light, which is not described in this crystal violet amyloid context. So the staining approach is polychromatic due to its use of multiple colors to enhance contrast.