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As early as 2000 years ago, in the Western Han Dynasty (206BC-25AD) a form of printing had been developed.This was stone-tablet rubbing, very similar to brass rubbing in principle.So the world's first sheet of paper came into being.
Building on this idea, in the Sui Dynasty (581-618AD) there developed the practice of carving text on a wooden board, which was then covered in ink, and then it was printed page by page onto sheets of paper.
These are paper, gunpowder, the compass and printing.
Interestingly the word 'paper' is derived from 'papyrus'.
During the Tang Dynasty (618-907) the technique spread across Asia, through Philippines, Vietnam, Korea and Japan..
But although it was a great advance, this block printing technology had a serious drawback.