|  A collection of seal impressions gathered 
      into book form. Collections of Chinese seals from the Chou and Ch'in dynasties 
      are called ko-inpu Γσ, kodou inpu ΓΊσ, or kandou inpu 
      ΏΊσ. Ancient seal imprints collected in Japan are called yamato inpu 
      εaσ. In both cases, the imprints were collected for study and for appreciation. 
      In the case where original seals are collected and imprints taken from them, 
      the collections are called genkenbon ΄ϋΒ{, or jitsuouhon 
      ΐ{. These are the most valuable. In cases where the original seal is not 
      available, other methods are: making an impression from a copy of the original 
      seal, carving another seal from an impression on paper; or photographing 
      the impression and publishing it as is. None of these methods is totally 
      satisfactory, but are of some value. The oldest extant collection of seal 
      impressions, the Senwa inpu ιaσ, consists of four scrolls dating 
      back to the Northern Song dynasty and is a valuable source of 
      these ancient metal and stone engravings. Many inpu were published 
      during the Song and Yuan dynasties, but most were lost, and it was not until 
      the middle Ming period that interest in old seal impressions revived. In 
      1572, Wang Chang published the Shuuko inpu WΓσ, which is the oldest 
      available record of ancient Chinese seals today. In Japan, the oldest collection 
      of seal impressions is the Honchou gain {©ζσ which is appended to 
      the HONCHOU GASHI {©ζj, written in the 17c.  |