How to Store Leather to Prevent Mold and Dry Rot

Vegetable-tanned leather and finished leather goods are sensitive to their storage environment. Improper storage leads to mold, dry rot, brittleness, discoloration and warping. Whether you keep raw hides or finished handmade leather items, these simple rules will help preserve their quality for years.

The biggest enemy of leather is high humidity. Mold grows quickly when relative humidity stays above 65%. Keep your leather storage area between 40% and 60% humidity. A low-cost hygrometer helps you monitor conditions. If your space is damp, use a dehumidifier or silica gel packs. Replace silica gel regularly once it absorbs moisture. Never seal leather tightly inside airtight plastic bags; trapped moisture will trigger mold faster.

Dry heat is another major risk. When humidity drops too low, leather loses its natural oils. It becomes stiff, cracks easily and suffers dry rot. Keep leather away from direct sunlight, heaters, radiators and air conditioner vents. Sunlight also fades dyes unevenly, ruining carefully dyed projects. Avoid garages, attics and basements that swing wildly between hot and cold.

How you arrange leather also matters. Lay large flat hides on clean, breathable shelves. Use acid-free paper between layers. Newspaper and regular printed paper can transfer ink and stain leather. Do not stack heavy objects on top; pressure creates permanent creases. Hang straps and unfinished pieces on wide, smooth hangers. Thin wire hangers leave sharp indentations.

For finished leather crafts such as wallets, belts and pouches, clean them lightly before long-term storage. Wipe off dirt and oils from skin. Condition vegetable-tanned leather lightly with leather balm if it feels dry. Store them in cotton dust bags, which let air circulate.

Check your stock every few weeks. Early mold spots can sometimes be treated, but widespread mold or deep dry rot is nearly impossible to reverse. Good storage is far easier than repairing damaged leather.

In short: stable moderate humidity, away from heat and sun, breathable wrapping, no heavy stacking. Follow these habits, and your leather stock and finished work stay supple and ready for crafting.