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protection master

Broader Term: 

n. ~ A high-quality copy of an edited master that can be used to make printing masters.


A protection master is created for use in case the original master is damaged.

(Feltenstein 2003) The fine-grain [master], which is also called a 'protection master,' can be used to make duplicate negatives from which other prints are struck. Also, if the original negative is damaged – and many of them eventually are – you can copy a segment of the fine-grain and insert a new section of 'dupe' negative into the original. The fine-grain print yields a negative that looks almost like what you would get from a camera negative. There's very little loss of sharpness or detail.