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| Start / | Knowledge / | Stamps / |
| Categories | Category Changes | Changes | Designs | Differences | Do It Yourself Postage Stamps | Fakes | Issue Occasions |
| Kinds | Parallel Issues | Quality | Shapes | Sizes | Semi-postal Postage Stamps Issue Occasions | ||
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Knowledge / Stamps / Postage Stamps / Quality |
Postage stamp quality: subjective assessment of the quality of all properties of a postage stamp |
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Faultless postage stamp: postage stamp without conditional of manufacturing or wrong handling originated quality defect |
Faulty postage stamp: common term for a postage stamp with conditional of manu-facturing or wrong handling originated quality defect |
Damaged postage stamp: postage stamp with quality defect originated by wrong handling |
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Sensitive postage stamp: postage stamp which reacts sensitive on environmental conditions |
Water sensitive postage stamp: postage stamp which reacts sensitive on water |
Postage stamp with break: postage stamp printed on heavy creased paper with damaged paper structure |
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Torn postage stamp: Postage stamp that was forcibly separated into several parts |
Discoloure postage stamp: postage stamp with changed colour by light or chemical reaction |
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