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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Silk Threads / Errors |
Silk thread error: philatelic term for a paper with silk thread deviation caused by error |
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Missing silk thread: postage stamp printed on paper without silk thread caused by error |
Silk thread colour error: philatelic term for a deviation from the intended silk thread colour caused by error |
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Double silk thread: postage stamp printed on paper with twice instead of once silk thread caused by error |
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