Protecting any FNMT silver starts with low humidity, neutral plastics (no PVC contact), and fewer case openings—the mint’s standards are high, but home environments punish bathrooms and acidic cardboard.
Minimum bar: diameter capsules, gloves, albums/boxes without cheap plastic smell.
Storage environment
- Skip kitchen/bath for display cases.
- Cheap hygrometer if you run >20 FNMT pieces.
- Silica refreshed each humid season.
Leuchtturm and EU ecosystem
Brands publishing diameter charts cut sizing errors on one-off FNMT buys.
Amazon
European system with documented sizes and compatible caps within one family.
- Hub coin capsules intro article.
- No aggressive cleaning on FNMT proofs.
- Affiliate-ready.
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