| Polyvinylalcohol | Residual anthocyanin (% of total anthocyanin) | |
|
| 30 days | 60 days |
| 0 mg/ml | 18.4 ± 4.0 | 11.3 ± 3.0 |
| 1.0 | 21.9 ± 0.5 | 12.6 ± 1.0 |
| 8.3 | 25.8 ± 3.0 | 14.4 ± 1.7 |
| 25 | 31.1 ± 6.7 | 17.9 ± 3.3 |