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It is crucial that offset ink resist water-in-ink emulsification (i.e., repel rather than absorb water). It also should withstand degradation by the fountain solution that covers the non-printing areas of the engraved plate. Offset ink needs to be very rich in pigment so that its full color vibrancy is perceptible, even in minute quantity. [2] [3]
Yellow cyan magenta and black solid ink sticks. The black ink stick is cut in half. Solid ink (also known as hot melt ink [1] [2]) is a type of ink used in printing.Solid ink is a waxy, resin-based polymer that must be melted prior to usage, unlike conventional liquid inks.
Waterless printing is an offset lithographic printing process that eliminates the use of water or the dampening system used in conventional printing. [1] Unlike traditional printing presses, waterless offset presses do not use a dampening solution to clear the press of ink . [ 2 ]
Printing quality is highly influenced by the various treatments and methods used in creating paper and enhancing the paper surface. Consumers are most concerned with the paper-ink interactions which vary for certain types of paper due to different chemical properties of the surface. [8] Inkjet paper is the most commercially used type of paper.
In printing, set-off is the term given to the unwanted transfer of ink from one printed sheet to another. The problem can occur with most types of printing, and is avoided by the use of slipsheets between copies (so any ink transfer occurs onto discardable paper) or anti-set-off spray powder.
Lacquer soot ink is made from the soot of dried raw lacquer. It has a shiny appearance and is most suitable for painting. Charcoal ink is made using ordinary wood charcoal. It has the least amount of glue and so spreads on paper more than other inks. It is mainly used for freestyle painting and calligraphy.
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High-quality inkjet printing with dark, crisp lines requires that the paper have exactly the right absorbency to accept the ink but prevent sideways spread. Many general-purpose office papers of weights around 21 to 27 lb (80–100 g/m 2 ) have been reformulated to work equally well with both inkjet and laser printers .