Notebook paper approval: separate show-through from ink penetration

Baron Wang

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Joined
2026
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Shanghai, China
For notebook inner paper, I'd keep show-through and ink penetration as separate sign-off items. A faint shadow on the reverse isn't the same as coloured ink reaching that surface.
For a useful writing reference, I'd use the same pen and ink, backing sheet, light and inspection interval on each candidate. Then keep the marked sheets with the paper grade and sample reference. GSM alone doesn't define that result.
When notebooks are part of a print order, do you retain a writing sample with the print approval, or handle that separately?
 
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