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In other words, a translucent material is made up of components with different indices of refraction. A transparent material is made up of components with a uniform index of refraction. [1] Transparent materials appear clear, with the overall appearance of one color, or any combination leading up to a brilliant spectrum of every color.
Lithophane of Frederick the Great, lit from front.After a well known painting by Julius Schrader (1849). [1] The same lithophane, backlit. A lithophane is a thin plaque of translucent material, normally porcelain, which has been moulded to varying thickness, such that when lit from behind the different thicknesses show as different shades, forming an image.
The term (hornbook) has been applied to different study materials in different fields but owes its origin to children's education, represented by a sheet of vellum or paper displaying the alphabet, religious verse, etc., protected with a translucent covering of horn (or mica) and attached to a frame provided with a handle.
Pure cellulose fiber is translucent, and it is the air trapped between fibers that makes paper opaque and look white. [3] If the fibers are refined and beaten until all the air is taken out, then the resulting sheet will be translucent. Translucent papers are dense and contain up to 10% moisture at 50% humidity.
Onionskin or onion skin is a thin, lightweight, strong, often translucent paper, [1] named for its resemblance to the thin skins of onions. [2] It was usually used with carbon paper for typing duplicates in a typewriter , for permanent records where low bulk was important, or for airmail correspondence. [ 3 ]
The words "opacity" and "opaque" are often used as colloquial terms for objects or media with the properties described above. However, there is also a specific, quantitative definition of "opacity", used in astronomy, plasma physics, and other fields, given here.
In the field of lexical semantics, semantic transparency (in adjective form: semantically transparent) is a measure of the degree to which the meaning of a multimorphemic combination can be synchronically related to the meaning of its constituents. Semantic transparency is a scalar notion.
Transparency in PDF was designed not to cause errors in PDF viewers that did not understand it – they would simply display all elements as fully opaque. However, this was a two-edged sword as users with older viewers, PDF printers, etc. could see or print something completely different from the original design.