Wednesday, 4 May 2011

The wood block is carefully prepared as a relief matrix, which means the areas to show 'white' are cut away with a knife, chisel, or sandpaper leaving the characters or image to show in 'black' at the original surface level. The block was cut along the grain of the wood. It is only necessary to ink the block and bring it into firm and even contact with the paper or cloth to achieve an acceptable print. The content would of course print "in reverse" or mirror-image, a further complication when text was involved. The art of carving the woodcut is technically known as xylography, though the term is rarely used in English.
For colour printing, multiple blocks are used, each for one colour, although overprinting two colours may produce further colours on the print. Multiple colours can be printed by keying the paper to a frame around the woodblocks.
There are three methods of printing to consider: 
Used for many fabrics, and most early European woodcuts (1400–40) These were printed by putting the paper or fabric on a table or other flat surface with the block on top, and pressing or hammering the back of the block.
Apparently the most common for Far Eastern printing on paper at all times. Used for European woodcuts and block-books later in the 15th century, and very widely for cloth. The block goes face up on a table, with the paper or fabric on top. The back is rubbed with a "hard pad, a flat piece of wood, a burnisher, or a leather frotton".
Printing in a press
Presses only seem to have been used in Asia in relatively recent times. Simple weighted presses may have been used in Europe, but firm evidence is lacking. Later, printing-presses were used (from about 1480). A deceased Abbess of Mechelen in Flanders in 1465 had "unum instrumentum ad imprintendum scripturas et ymagines ... cum 14 aliis lapideis printis" ("an instrument for printing texts and pictures ... with 14 stones for printing") which is probably too early to be a Gutenberg-type printing press in that location.

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