The analog proof is created by shining light through the negatives and exposing a light-sensitive paper that turns from white to blue.

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A blueline is a proof that is created by shining light through the negatives and exposing a light-sensitive paper that turns from white to blue. The blueline helps reveal scratches and flaws in the negatives as well as any assembly errors, such as a reversed illustration.

The Analog Proof Is Created by Shining Light Through the Negatives