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Umschulung Farbnegativ – Montage ( Tiefdruck )

This is from a CV for somebody who has mostly worked as an industrial painter but who has done other things including this work in the printing industry.

There are many entries for 'Montage' in the glossaries including one suggestion of 'typesetting/photocomposition' under printing and publishing but I'm still not sure what is best to use here. I still think 'colour negative - assembly' might be a possibility but I can't find a google reference to back it up with. The 'Tiefdruck' is apparently 'gravure printing'