 |
 |
 |
|
 |
|
 |
| Start / | Knowledge / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
 |
Knowledge / Luminescence / Differences |
Luminescence difference: common term for two the same postage stamps with no luminescence agreement |
    |
Fluorescence quantity difference: common term for two the same postage stamps with no fluorescence quantity agreement (e.g. with or without fluorescence) |
 |
 |