| Elements | Tannins | Tannin-Ca complex | ||
| Weight (%) | Atomic (%) | Weight (%) | Atomic (%) | |
| C | 58.78 | 65.51 | 29.10 | 38.41 |
| O | 41.22 | 34.49 | 56.37 | 55.85 |
| Ca | 0 | 0 | 14.53 | 5.74 |