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Viscosity and pH of the tannin–sucrose–sulfuric acid solution.
| Addition of Sulfuric Acid Solution (g) | Mixture Ratio of Tannin–Sucrose–Sulfuric Acid | Concentration (wt %) | Viscosity at 20 °C (mPa·s) | pH |
|---|---|---|---|---|
| 0 | 25:75:0 | 40 | 51.3 | 4.8 |
| 0.9 | 25:75:0.36 | 51.0 | 2.5 | |
| 1.25 | 25:75:0.50 | 50.4 | 2.0 | |
| 2.4 | 25:75:0.96 | 49.5 | 1.5 | |
| 10.4 | 25:75:4.16 | 47.3 | 1.0 |
