|  Lit. 
	  later seal. An artist's seal placed posthumously on a painting or calligraphy, 
	  sometimes by a well-meaning person related to the artist, meant to authenticate 
	  his/her unsigned work. More commonly, an ato-in was added by an unscrupulous 
	  person to camouflage the seal of a lesser artist after erasing the original 
	  seal.  |