Subsequently, it is said that he traveled and sold "Ishida Sanyaku medicine" whose secret recipe has been passed on in his family; at the same time he also trained himself by fighting in many swordsmanship matches with other schools in dojos located around the country.
その後は実家秘伝の「石田散薬」を行商しつつ各地の道場で他流試合を重ね修業を積んだと言われる。