The earliest existing example of woodblock printing is on a piece of hemp paper, dating from around 660 AD.
It is also the medium of choice for the oldest printed book, the The other type of printing is the predecessor of typesetting, called movable type. It began as a theory by Chinese scientist, Shen Kuo during the Song Dynasty in 1088 AD.
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These notes were initially used only by the very wealthy, but eventually they were circulated by the Song Dynasty when there was a shortage of copper coins. These notes did not replace copper coins- they were organized by region (rather than having a national currency) and were more like credit notes with a time limit.
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