Ink peel resistance grade results of untreated and sizing paper treated with different agents.
| Sizing samples | Color fastness grade (wet) | Ink peel resistance grade | ||
|---|---|---|---|---|
| Black | Blue | Black | Blue | |
| Untreated | 2–3 | 2–3 | 1–2 | 1 |
| TBPU/PVA | 4 | 4 | 4–5 | 4–5 |
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