在纸张普及以前,印章的用法基本上以钤压封泥为主。晚清以来,各地出土了大量的封泥,时代包括战国、秦、汉。孙慰祖先生主编的《古封泥集成》即收有2600余品,这还不包括近年全国各地出土的大批秦汉封泥。封泥也是古代印章资料的重要组成部分。封泥的谱录是以拓片方式辑成的,其与古玺印不同之处在于阴文印变为阳文封泥。封泥边有厚有薄,无规律可言,文字与封泥边时有残断 Before the popularity of paper, the use of seal basically to suppress the pressure of sealing mud. Since late Qing Dynasty, lots of clay have been unearthed around the country, including the Warring States, Qin and Han dynasties. Sun Weizu editor of the “ancient seal integration” that received more than 2,600 products, which does not include the exclusion of large quantities of Qin and Han Dynasties in recent years throughout the country sealing mud. Mud sealing material is also an important part of the ancient seal. Seal of the spectrum is based on rubbings compiled into series, with the ancient seal printed difference is that the yin and yin seal into yang seal mud. Sealing mud side are thick and thin, no law at all, when the text and sealing mud edge broken