Cognac and the other old spirits follow the whisky rule: upright, dark, know the fill level. In the overview Security for collectors it is the same physics as Whisky, with different labels.
What gets ruined without a thief
Light and heat, a leaking capsule, a cellar that gets hot in summer. You store upright and you write the fill level down. A bottle you open for a meal leaves the collection list.
When someone comes
The bar in the living room is visible. The bottles with a receipt and a price stand somewhere else, locked, without a strip of the vintages on the door. In the Radar this is not a word of its own.
The folder
House, designation, age or bottling, fill level, open or closed, receipt. Photo of the label and the shoulder.