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Cell wall

The term cell wall has its origin in the use of lead and book printing, as intermediate spaces were produced by inserting metal strips into the printing forms. In gravure the cell walls are also the non-printing areas that keep the ink in the cell. They stretch like a depression-type network over the printing cylinder and thus allow the clean guidance of doctor blades to wipe off superfluous ink. 

Depending on the form of the cells and the engraving process the cell walls (blue) can vary a lot.
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