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进行了一些使用固化的柿子丹宁从水溶液中回收金的试验。这种吸附剂从含有四氯金酸（Ⅲ）的溶液中吸附金的效率很高，而从含有金（Ⅰ）的流代苹果酸钠和二氰金酸钠（Ⅰ）的溶液中吸附量很小。金的吸附是快速的，受溶液中pH值、温度、溶液中金的浓度和吸附剂数量影响。吸附的金很容易用1M硫脲溶液解吸，表明固化的柿子丹宁能在吸附-解吸循环中重复利用以回收金。
Several experiments were conducted using hardened persimmons tannin to recover gold from aqueous solutions. The efficiency of adsorption of gold by such an adsorbent from a solution containing tetrachloroauric acid (III) is high, whereas the amount adsorbed from a solution containing sodium (I) sodium flowed sodium malate and sodium dicyanurate (I) Very small. The adsorption of gold is rapid, depending on the pH of the solution, the temperature, the concentration of gold in the solution, and the amount of adsorbent. The adsorbed gold is readily desorbed with 1M thiourea solution, indicating that the cured persimmon tannin can be reused to recover gold during the adsorption-desorption cycle.