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All the fibrous material, once softened, was beaten into a pulp which was said to be rather like porridge, and the birch leaf extract was added. The great thing about Chai Lun's invention was that his paper could be mass-produced.This 'porridge' was then filtered through a flat mesh strainer made of cloth, leaving the fibres lying flat on the screen. It was also ideal to write on, inexpensive, light and so easy to store and to carry.So the world's first sheet of paper came into being.Paper gradually spread from China, reaching Korea in the 3rd century AD.In fact the earliest paper is very similar to modern paper in concept and technology.The inventor of paper is traditionally assumed to be Chai Lun (or Ts'ai Lun), who was the head of a royal workshop in 2nd century China.

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This was stone-tablet rubbing, very similar to brass rubbing in principle.

Around 2,200 BC the Egyptians in the lower Nile region discovered that a type of reed, papyrus, could be formed into a writing surface by overlapping thin strips which had been soaked for a long time in water, and then pounding and pressing it into a sheet.

But it wasn't really paper as we know it, and it was difficult to write on, and expensive.

He made his paper by boiling up all the raw materials with wood ash or lime for up to 35 days.

Another vital ingredient was birch leaves, from which the mucilage was drained out for strengthening the paper, and giving it evenness and smoothness.

The only significant difference between the paper you print on from your computer and the Chinese paper is the 'filler' we now use to make the paper really smooth. Before printing was invented, knowledge could only be passed on my word of mouth, or by extremely expensive handwritten manuscripts.

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