Letter on "Ch'eng Hsin 
T'ang" Paper
Tsai Hsiang
Northern Sung Dynasty
(A.D. 960-1126)
     This letter written 
in cursive regular script 
calligraphy  consists  of 
six columns containing a 
total  of  56  characters.  
The paper on which it is 
written is believed to be 
"Ch'eng Hsin T'ang" paper, 
which  is  said  to  have 
been made for imperial use
by master paper-makers of 
Hsuan-ch'eng on the orders 
of Li-Yu,  last emperor of 
the Kingdom of Southern 
T'ang  (Five  Dynasties
period).