The main difference between the two is that dyes are soluble, while pigments are not. Screen Printing inks by the pigment, connecting materials, fillers and other materials uniformly dispersed mixed slurry. Printing inks are also categorized by process: lithography, rotogravure, flexography, and digital printing, the … Chemical composition of Ink consisit of three main ingredients: Pigment, which is the coloring material in the ink. No information about their chemical composition was available from manufacturer. Establishing of Chemical Composition of Printing Ink. Four colours used in offset printing are cyan, mageta, yellow and black. A digital printing ink composition comprises at least a glass frit or metal particles having a particle size less than 2 µm and a dispersion medium, preferably comprising also an inorganic pigment, and is suitable for deposition onto substrates. Colorants may be dyes, but are typically pigment-based. The printed ink coating can be fired to yield a permanent coating. That means it is thick and tacky.It is typically delivered in canisters. Colorants may be dyes, but are typically pigment-based. Once the general objective was fixed, the first step was to determine the chemical composition of the contemporary printing inks and, on to the basis of the information obtained, to search for criteria that would allow us to differentiate between the prints made of different inks. CCMR claims that dyes are colored materials that dissolve in the ink. Ink used for lithographic offset presses is a paste, rather than a fluid. Establishing of Chemical Composition of Printing Ink. They are often better than dyes at keeping their color for many centuries and for withstanding high heat, intense light, and exposure to weather or chemical agents. Printing inks are a customer- and applications-specific formulations business. Printing inks are formulated from three basic components: a colorant, a vehicle system to carry the colorant, and additives such as waxes and driers. Colorants may be dyes, but are typically pigment-based. There are two major segments—commercial printing/publishing and packaging. The major classes of printing processes are lithography or the offset process, flexography, gravure printing, screen printing, letter press and digital printing. Similarly, the composition of printing inks depends on the type of printing process - specifically, how the ink-distribution rollers are arranged in the printing press. Ink is a liquid or paste containing some kind of colorant used mostly for writing, printing and drawing. This has resulted in printing being used on many different surfaces ranging from aluminium can and plastic bottles through to paper.