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  2. Banknote - Wikipedia

    en.wikipedia.org/wiki/Banknote

    Generally, the paper used is different from ordinary paper: it is much more resilient, resists wear and tear (the average life of a paper banknote is two years), [54] and also does not contain the usual agents that make ordinary paper glow slightly under ultraviolet light. Unlike most printing and writing paper, banknote paper is infused with ...

  3. CMYK color model - Wikipedia

    en.wikipedia.org/wiki/CMYK_color_model

    CMYK color model. Color printing typically uses ink of four colors: cyan, magenta, yellow, and black. When subtractive CMY inks are combined at full strength, pairwise combinations are red, green, and blue. Combining all three gives an imperfect black color. What appears as cerulean ( ) in the top image is actually a blend of cyan, magenta ...

  4. Iron gall ink - Wikipedia

    en.wikipedia.org/wiki/Iron_gall_ink

    Iron gall ink (also known as common ink, standard ink, oak gall ink or iron gall nut ink) is a purple-black or brown-black ink made from iron salts and tannic acids from vegetable sources. It was the standard ink formulation used in Europe for the 1400-year period between the 5th and 19th centuries, remained in widespread use well into the 20th ...

  5. American Express - Wikipedia

    en.wikipedia.org/wiki/American_Express

    Share of the American Express Company, 1865. In 1850, American Express was started as a freight forwarding company in Buffalo, New York. [13] It was founded as a joint-stock corporation by the merger of the cash-in-transit companies owned by Henry Wells (Wells & Company), William G. Fargo (Livingston, Fargo & Company), and John Warren Butterfield (Wells, Butterfield & Company, the successor ...

  6. Under color removal - Wikipedia

    en.wikipedia.org/wiki/Under_color_removal

    UCR removes the color inks under the Black, resulting in a single layer of ink which sticks to the sheet better, and saves on the consumption of ink. There is no universal rule for UCR. The amount required will depend on the printing press, paper, and ink in use. Advantages: Solves the ink not sticking problem and; Advantages: Black ink is cheaper.

  7. Rich black - Wikipedia

    en.wikipedia.org/wiki/Rich_black

    Rich black. Rich black, in printing, is an ink mixture of solid black over one or more of the other CMYK colors, [1] resulting in a darker tone than black ink alone generates in a printing process. [2][3] A typical rich black mixture might be 100% black, 50% of each of the other three inks. Other percentages are used to achieve specific results ...

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