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| Start / | Knowledge / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Gums / Errors |
Gum error: philatelic term for a gum deviation caused by error |
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Missing gum: postage stamp with not carried out gum caused by error |
Gum colour error: philatelic term for a deviation from the intended gum colour caused by error |
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Bark gum: postage stamp with unevenly thick and very streaky gum caused by error |
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