# Securing ancient coins: patina is the value, cleaning is the damage

> Secure ancient coins: do not clean the patina, note the provenance, clarify export and ownership before you buy.
> Quelle: https://tresorrari.de/artikel/antike-muenzen-sammlung-sichern · Stand: 2026-10-01 · Tresorrari Redaktion

An ancient coin carries its history in the surface. Scour it bright and you delete the price, and often the chance to tie it to a find spot. In the overview [Security for collectors](/artikel/sicherheit-fuer-sammler) it sits with the pieces where theft and the law stand side by side.

## The legal position first

Many ancient coins are legal in the trade, with a provenance that can be stated. Some come from looted excavations, and you may not buy those in order to "save" them. Before you buy, you require a provenance that you write down: auction, dealer, year, lot number. Without that line, the coin in case of doubt becomes a problem, not a treasure. The authority and the cultural property protection law decide the individual case. This text does not replace that.

## Theft and decay

In the house they go the way other coins go: album, tin, backpack. The big private robbery remains Coconut Grove, described with the [gold coins](/artikel/goldmuenzen-sammlung-sichern). Patina suffers from PVC, from damp, and from every attempt to clean. You store them dry, dark, in inert material, in the anchored cabinet, once the sum warrants it.

## What you write down

Mint, denomination, metal, diameter, the provenance line, a photo of both sides with a scale. The photos and the invoices sit in the document cabinet. A coin without this folder is a memory after a burglary.

## Häufige Fragen

### May I clean an ancient coin?

No, if the patina belongs to the piece. Cleaning is damage that no cabinet undoes.

### Do I need a provenance proof for every coin?

For everything you buy from now on, one line: where from, when, which lot. Without the line, a later sale or the export becomes a dispute.

### Are ancient coins in the Radar?

The reports say coins, without separating age. Your list has to record the age itself.