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| Start / | Knowledge / |
| Accidentals | Changes | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Gums / Mistakes |
Gum Mistake: printers term for a deviation caused by a gum mistake |
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Missing Gum: postage stamp with not carried out gum caused by mistake |
Gum Colour Mistake: printers term for a deviation from the intended gum colour caused by mistake |
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Horizontal Ribbed Gum: postage stamp that was provided with a horizontal instead of vertical ribbed gum caused by mistake |
Vertical Ribbed Gum: postage stamp that was provided with a vertical instead of horizontal ribbed gum caused by mistake |
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Bark Gum: postage stamp with unevenly thick and very streaky gum caused by mistake |
Streaked Gum: postage stamp provided with a unevenly gum with stripes, elongated grooves and / or small gum-free areas caused by mistake |
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Gum With Alien Element: postage stamp in which an alien element was included in the gum caused by mistake |
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