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TONLI Black Cardstock | Other Ordinary Black Cardstock |
| Differences in craftsmanship | Wet Process Pulp-Dyed | Surface Coating Dyeing |
| Comparison Dimensions | Pulp Stage (Before Paper Blank Forming) | Finished Base Paper Stage (after base paper forming) |
| Dyeing Timing | Black pigment penetrates evenly into every fiber, resulting in a completely black fiber from the inside out | Only 1-2 layers of black coating sprayed on the surface; core remains white |
| Risk of whiting | No Whitening: Fibers bend synchronously during folding, eliminating coating Whitening issues | High risk of whitening: Obvious white edges appear when folding over 90°, cracks easily after repeated folding |
| Folding Duration (MD) | ≥120 folds (400g) | ≤15 folds(400g) |
| Color Fastness(Maximum 5) | Grade 4-5, no color fading from rubbing | Grade 2-3, surface scratched and faded |
| Batch Color Difference ΔE | ≤0.5, invisible to the naked eye | ≥2.0, obvious color difference between batches |
| Coating Dependence | No surface coating | Fully relies on surface coating |
| Eco-friendliness | Low VOC, 100% recyclable | Contains plastic coating; high VOC content, difficult to recycle |
| Lifespan | Long-term storage without fading or discoloration | Coating aging and yellowing appear within 1-2 years |