The offset printing inks used on an offset printing press must be able to carry the full-intended color and covering power to the paper despite the split-film action. This occurs because the offset blanket picks up only a portion of the ink from the plate and delivers only a portion of that to the paper. The film of ink reaching the plate, then, is very thin, and the ink must be able to show its full color and opacity with this film.
Ink is made of three main ingredients: Pigment, which is the coloring material in the ink: Vehicle, which is the liquid that holds the particles of pigment; and Modifiers. which control the drying of the ink as well as other factors such as smell, scuff resistance, and fading.
There are two basic types of pigment used in offset printing inks. Organic pigment, which is made from carbon, is used for making black ink. Inorganic pigments, which are made by mixing various chemicals together, are used for colored inks. For example, sulfur, silica, or china clay can be combined with either soda ash or sulfate salts to make ultramarine blue ink.
PRAVR pigments offer the offset inks manufacturer choices in chemistries, colour and transparency! This exciting range of blue and unique chlorinated green support expansion of colour space and properties.
