Considering the amount of contained silver, 25% of the stated price was a proper additional amount, but the reason why this agreement was made was that the Tsushima Domain received a report from the Korean side in which they found out the percentage of silver content did not meet the defined amount after their analysis of the grade.
含有銀量で換算すれば2割5分増しであるが、これは元禄銀の品位を分析した結果、含有率が規定量に満たないなどの申し出が朝鮮側からあったなどのやり取りによるものであった。