Which practice is most likely to cause damage to an old book?

Which practice is most likely to cause damage to an old book?

• A. Handling with care
• B. Storing upright on a shelf
• C. Exposing to direct sunlight
• D. Keeping it in a climate-controlled environment

Answer: (C)

Direct sunlight is especially harmful because ultraviolet light and heat break down paper fibers and ink, leading to fading, embrittlement, and accelerated aging. Old books often use materials that are more sensitive to light, so the damage accumulates quickly when they’re exposed to sunlight. Handling with care protects against physical damage like tears and smudges, storing upright on a shelf is a normal, safe practice when the shelf is sturdy and not overcrowded, and a climate-controlled environment reduces humidity and temperature swings that can warp pages and promote mold. Because of these factors, direct exposure to sunlight causes the most damage among the options.

Direct sunlight is especially harmful because ultraviolet light and heat break down paper fibers and ink, leading to fading, embrittlement, and accelerated aging. Old books often use materials that are more sensitive to light, so the damage accumulates quickly when they’re exposed to sunlight. Handling with care protects against physical damage like tears and smudges, storing upright on a shelf is a normal, safe practice when the shelf is sturdy and not overcrowded, and a climate-controlled environment reduces humidity and temperature swings that can warp pages and promote mold. Because of these factors, direct exposure to sunlight causes the most damage among the options.