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| Start / | Knowledge / | Safety Measures / |
| Accidentals | Changes | Designs | Differences | Errors | Fakes | Kinds | Mistakes | Parallel Issues | Printers Waste | Quality |
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Knowledge / Safety Measures / Watermarks / Quality |
Watermark quality: subjective assessment of the quality of all properties of a watermark |
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Perfect centered watermark |
Very good centered watermark |
Good |
Slightly |
Somewhat |
Clearly |
Watermark quality grades: subjective perception of a watermark quality in different grades and conditions |
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Faultless watermark: watermark without conditional of manufacturing or wrong handling originated quality defect |
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