Definitions for "Newton Rings"
Concentric multi-colored rings caused by the pressing of film to glass. This can be a problem in scanning from negatives or transparencies.
In reproduction from either photography or lithography, an objectionable series or irregularly colored circles caused by the prismatic action of interfacing different smooth surfaces together, such as in contact frames or transparencies on a scanner drum.
An interference pattern created at the meeting point of two refracting surfaces. When exposing a polymer plate in a vacuum frame, the even distribution of pressure can be controlled by watching the Newton rings. When the vacuum is evenly distributed throughout the frame, the entire plate is covered with tiny Newton rings.