What happens to stains on a rough surface?

• A. Distorted stains
• B. Stains vanish
• C. Stains become clearer
• D. Stains gain color

Answer: (A)

Rough textures alter how stains appear because the uneven surface scatters light and traps dye in tiny crevices. This interaction makes the stain’s boundary look jagged and its overall shape stretched or warped, so the pattern appears distorted rather than neat and clear. The stain remains present, but its edges are irregular due to the microtopography and varying absorption across the rough surface. It doesn’t vanish, nor does it inherently gain color or become clearer simply from roughness; those changes would require different lighting, viewing angle, or chemical interactions, not just surface texture.