Art Terms Glossary beginning with N

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Negative print
The opposite of a positive print, in which the tonal values are reversed shadows appear light and highlights dark. Negative prints can be made by various methods, such as placing photographic paper instead of film in the camera, photographing a negative, or printing from a positive transparency.
Non-destructive Optical Microscopy
An examination technique which uses a variety of devices, such as single lens magnifying glasses, head loupes and binocular microscopes, to examine an artwork's surface, enabling much more information to be documented. Examination using low magnification can reveal details of color, surface texture, tool marks, joints, repairs, wear, surface coatings, and corrosion that are not visible to the naked eye.