This section shows colour changelings and printing oddities found on classic french issues.
Changelings are stamps whose colours have shifted over time, often due to oxidation, humidity, or exposure to sulphur in album materials. Reds and oranges can darken to brown or black.
The remaining stamps show minor plate flaws, over-inking, under-inking, misaligned impressions, broken frame lines, misplaced dots, and other small printing irregularities.
