Persimmon contains a certain number of single Ning ( tannic acid ), a higher content of persimmon skin, mouth, tongue hemp astringent to eat persimmons are single Ning convergence.

Tannin cells of persimmon fruits of 45 samples from 41 varieties in their middle stage development were observed histologically with Dateplum persimmon and American persimmon as the control.

A study was conducted to clarify the seasonal changes in components of tannin and the relationships between the differences in tannin and fruit astringency of cultivars.