Those “silver insects” that you see running inside books and shelves are known as silverfish — small, silvery-gray, wingless insects that thrive in dark, damp, and paper-filled environments like bookshelves, bathrooms, pantry, or basements. They feed on paper, glue, starch, and fabrics, which is why they love books and wallpaper.

Even though they do not harm people, silverfish are:

• A sign of high humidity, which can lead to mold or other pests.
• Difficult to eliminate once they settle in as they can live for years and reproduce quickly.
• Destructive to books, papers, and heirlooms, especially in damp storage spaces.

Ways to get rid of silverfish naturally and effectively

1. Clean and declutter-

• Remove clutter: Especially piles of paper, old magazines, and cardboard boxes.
• Vacuum regularly: Get into cracks, baseboards, and behind furniture to remove eggs and food sources.
• Dust bookshelves and cupboards: Wipe down surfaces with a mild vinegar solution.

2. Control humidity – Silverfish love moisture.

• Use a dehumidifier or air conditioner to keep humidity below 50%.
• Fix leaks in plumbing or walls.
• Ensure good ventilation in bathrooms and kitchens.
• Avoid storing books or paper in damp basements or attics.

3. Natural repellents -Try these non-toxic, natural deterrents:

• Diatomaceous earth: Sprinkle a thin layer behind shelves, under sinks, or along baseboards. It kills insects by dehydrating them.
• Cedar oil or cedar chips: Place near bookshelves or closets — silverfish dislike the scent.
• Cloves, cinnamon, or lavender sachets: Place near affected areas; these scents repel them.
• Borax and sugar trap: Mix equal parts and place in small containers near problem areas. The sugar attracts, and borax kills.

4. Protect books and paper-

• Store books in sealed containers or zip bags if infestation is active.
• Use silica gel packs to keep book areas dry. Inspect and clean shelves regularly.
• Move valuable books away from damp walls or floors.

5. Trap and eliminate-

• Sticky traps: Place near bookshelves, under sinks, or corners where you see them.
• Glass jar trap: Wrap the outside with masking tape, drop in a small piece of bread. Silverfish can crawl in but can’t climb out.

6. Chemical options (if infestation is severe)

• Use silverfish-specific insecticide sprays or powders (with boric acid or pyrethrin) in cracks and crevices — avoid spraying on books or food areas.
• For serious infestations, consider calling a pest control professional.

DIY Silverfish repellent spray -natural and book safe

Ingredients:

1. 1 cup of distilled water
2. 1 cup white vinegar (optional)
3. 10 drops of essential lavender oil
4. 10 drops of cedarwood essential oil
5. 10 drops clove essential oil or cinnamon oil — both repel silverfish.
6. 1 teaspoon rubbing alcohol or witch hazel.

Instructions:

• In a clean spray bottle combine water, vinegar, and alcohol/witch hazel.
• Add the essential oils.
• Shake gently before each use.

How to use: Lightly spray around bookshelves, under furniture, behind toilets, sinks, or baseboards — anywhere silverfish might hide. Do not spray directly on books or paper; instead, spray cloth and wipe nearby surfaces. Reapply once every 1–2 weeks or after cleaning.

Silverfish won’t hurt you — but they can hurt your stuff. Keeping humidity low, sealing cracks, and using natural repellents (like cedar, clove, or lavender) are the best ways to prevent them.

FAQ:

• What smells keep silverfish away?
• Is vinegar effective against silverfish?
• Are silverfish harmful to humans?