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2.1 In prehistory and the ancient world: Tyrian purple. 2.1.1 China. ... Han purple was the first synthetic purple pigment, invented in China in about 700 BC. It was ...
The Royal purple or Imperial purple was probably used until the time of Augustine of Hippo (354–430) and before the demise of the Roman Empire. Dye chemistry [ edit ] Variations in colours of "Tyrian purple" from different snails are related to the presence of indigo dye (blue), 6-bromoindigo (purple), and the red 6,6'-dibromoindigo.
Shades of purple. There are numerous variations of the color purple, a sampling of which is shown below. In common English usage, purple is a range of hues of color occurring between red and blue. [1] However, the meaning of the term purple is not well defined. There is confusion about the meaning of the terms purple and violet even among ...
In the history of cryptography, the "System 97 Typewriter for European Characters" (九七式欧文印字機 kyūnana-shiki ōbun injiki) or "Type B Cipher Machine", codenamed Purple by the United States, was an encryption machine used by the Japanese Foreign Office from February 1939 to the end of World War II. The machine was an ...
Mauve ( / ˈmoʊv / ⓘ, mohv; [2] / ˈmɔːv / ⓘ, mawv) is a pale purple color [3] [4] named after the mallow flower (French: mauve ). The first use of the word mauve as a color was in 1796–98 according to the Oxford English Dictionary, but its use seems to have been rare before 1859. Another name for the color is mallow, [5] with the ...
Signature page and data page of a biometric passport (2007-2021) Each passport has a data page and a signature page. A data page is a page containing information about the passport holder. It is the only page in a U.S. passport laminated in plastic to prevent tampering. A data page has a visual zone and a machine-readable zone. The visual zone ...
A mimeograph machine (often abbreviated to mimeo, sometimes called a stencil duplicator or stencil machine) was a low-cost duplicating machine that worked by forcing ink through a stencil onto paper. [1] The process was called mimeography, and a copy made by the process was a mimeograph . Mimeographs, along with spirit duplicators and ...
A shower is a place in which a person bathes under a spray of typically warm or hot water. Indoors, there is a drain in the floor. Most showers have temperature, spray pressure and adjustable showerhead nozzle. The simplest showers have a swivelling nozzle aiming down on the user, while more complex showers have a showerhead connected to a hose ...