Those living inland turned to pot earth, then, one after another, iron, gold, silver, nickel .... From the appearance, design, weight, and composition of money, not only can one observe the vicissitudes of political history, one can also deduce the social, economic, cultural, and artistic development of the times.
此後，鐵、金、銀、鎳…… 等材質，全陸續派上用場。從錢幣的外觀、形制、輕重和成色，不但可觀察歷代政治的興革，更可推測當時的社會、經濟、文化、民生和技藝的發展狀況。