A technical dictionary of printmaking, André
Béguin.
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"Printmaking dictionary"

Deep etching
The last etching done in multiple bitings. This last etching isolates the relief
parts of the printing plate*. Such etching might be done manually (as in the first
steps) or then by photochemical means. Deep etching is meant to protect the whites
from the inking roller.[* gillotype ,
photo-engraving].
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