Paper Boxes Printing Quality

How to determine the Paper Boxes Quality?

1. Printing content, graphics & color comply with  the artwork or signed sample.
2. Overprinting: No discernible white ground(out of register), or  less than 0.2 mm of tolerance under measuring magnifier.
3. Color mismatch: No discernible color difference, or ΔE ≤ 3~6 when checked with a spectrodensiotometer.
4. No scratch, streak or ghosting is allowed.
5. No linting, ink spot or stain is allowed.
6. Ink abrasive resistance: stands over 40 crockmeter testings.
7. Words: intact and clear, no misspelling.
8. No dot deformation nor scumming.
9. Printed barcode: grading A~C when checking by a barcode verifier.