Positive transparencies in mounts suitable for projection, usually 35mm film in a mount of 2 by 2 inches. An image on film or glass, usually positive, intended to be viewed by means of light passing through the image and base using a viewer or projector
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Photographs having more than one hue/tone with neutral tones as well
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Photographs having gray, black, and white tones or images with only one hue (sepia)
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