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Offset Paper
Paper that has been manufactured with properties that make the paper suitable for offset printing. Some of the properties include dimensional stability, resistance to curling, high surface strength a surface free from foreign particles and a high level of resistance to moisture penetration.

Offset Printing
The transfer of an inked image from a plate to a blanket cylinder, which in turn transfers the image to the printing material as it passes between the blanket and the impression cylinder and pressure is applied. Also referred to as offset lithography.

Opacity
The extent to which a paper is capable of obscuring matter printed on the other side or on an underlying page. A paper with good opacity is one on which the printing on one side cannot be seen from the other under normal conditions. Usually expressed as a percentage (%).Opacity is the measure (percent) of the amount of light passing through a sheet of paper. Some papers have more fibres and/or fillers and as a result are more opaque than others. Papers containing more fibres and fillers have the ability to hold a printed image without showing through to the backside as easily as papers without as many fibres and fillers. Just because a paper is thicker does not guarantee that it is more opaque than a thinner paper. Some thinner papers may be more opaque because there are a greater number of fibres and/or fillers in their composition.OverprintingPrinting an image over an area that has already been printed. In printing colour process colours, one process colour is printed over another creating a secondary colour, which is a combination of two primary colours.