Six things that destroy coins
Each of these causes damage that cannot be undone. Nothing on this page links anywhere.
- 01
Soft vinyl (PVC) flips
The soft, floppy, faintly sweet-smelling flips. PVC plasticiser migrates onto the coin and degrades into hydrochloric acid, leaving green slime that etches the surface permanently. This is the most common way collectors destroy their own coins, and it happens in storage, silently, over years. If a flip is soft and bends without creasing, get the coin out today.
- 02
Any cleaning product sold for coins
"Coin cleaner," dips, polishes, pastes. A cleaned coin is a details-graded coin, and the market discount is typically severe and permanent. There is no product that restores a coin; there are only products that remove its skin. Conservation is a service performed by NCS or PCGS Restoration, not a bottle.
- 03
Brass brushes, erasers, and abrasives
Anything abrasive leaves parallel hairlines under magnification that no grader misses and no process reverses. The impulse to make a dark coin bright has cost the hobby more value than any counterfeiter.
- 04
Whizzing tools (rotary brushes)
Mechanically burnishing a coin's surface to imitate mint luster. It is considered alteration, it is detectable, and passing a whizzed coin off is fraud.
- 05
Ordinary paper, envelopes and cardboard
Sulfur in untreated paper products drives toning, and non-archival adhesives outgas. Manila envelopes and shoeboxes are how inherited collections arrive black.
- 06
Tape, glue, and adhesive-backed anything
Adhesive residue on a coin is permanent, and removing it takes solvents that create their own problems. Nothing sticky goes near a coin — including the sticky note describing it.
The chemistry behind these is set out in materials safety. For what to use instead, start with the fit finder.
Ordered by fitment and archival safety, from a dataset that holds no commission information. Some links earn us a commission; none of them change what appears here or in what order. How that works.