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Properly preserving antique coins to avoid tarnish it is essential to control their environment and アンティーク コイン handle them with care. First always handle coins by their edges using clean cotton gloves or tweezers made for numismatics to eliminate the transfer of natural sebum and salts. Even small amounts of moisture and salt from your fingers can trigger rapid oxidation.

Store the coins in a cool dry place beyond the reach of windows and heat sources. High humidity is one of the main causes of oxidation so aim for a stable moisture content under 50% RH. A climate controlled room or a sealed display case with silica gel packs can help prevent environmental fluctuations.

Select chemically inert storage solutions such as FDA-approved inert plastic sleeves. Avoid PVC based holders as they can produce toxic residues known as PVC residue. For permanent preservation airtight mylar capsules or non-abrasive mylar envelopes are ideal. These allow air circulation while protecting the surface from scratches and contaminants.

Never use standard paper folders as these materials often absorb and retain ambient humidity. If you must use a box choose one constructed from buffered archival cardstock or airtight plastic vault.

Never attempt to polish or clean vintage coins. Enthusiasts often assume cleaning restores luster but in reality it removes the natural patina and can reduce value. The best defense against oxidation is prevention through proper storage and minimal handling.

Conduct periodic evaluations of your coins for visible changes in surface tone or texture. When discoloration first appears consult a professional conservator rather than attempting to treat it yourself. With careful attention to environment and materials your historic currency can be preserved in pristine state for centuries.