(1) A monochrome or full-color photographic positive or picture on transparent support, in which the image is intended for viewing and reproduction by transmitted light. (2) In photography, also refers to the light transmitting power of the silver deposit in a negative and is the inverse of opacity. (3) Inexpensive, semi-permanent window posters printed on high-grade onionskin paper for application to glass surfaces. (4) The property of an ink that permits light to pass through it.

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