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One part of the design is not correctly positioned with another. Causes:  – Plates not mounted in register; – Incorrect web tension;  – Incorrect drive-roller adjustment; – Excessive web temperature;

Superimposing one colour onto another so that the first down does not lay properly before the next colour is printed. Causes:  – Incomplete drying of the first colour down prior

Parallel thin lines or bands about 1 mm wide, present in solid print areas running in the direction of the press. Causes: – Excessive ink transparency; – Excessive ink viscosity

Excessive ink transfer to substrate. Excess colour strength. Causes: – Ink viscosity too high or too low with dot gain; – Colour concentration too high; – Ink film too thick; – Contamination from

The colour is lacking in colour strength and body. Causes: – Excessive reduction in ink viscosity; – Excess extender varnish; – Ink settling out; – Ink film thickness too thin;

A condition caused by slippage at the moment of impression between the substrate and plate. Slur is characterised by the smearing of the trailing edges of a printed image or

Unwanted ink trans­fer onto substrate, ink metering system out of adjustment or dam­aged. Causes: – Undissolved ink particles; – Ink thrown off or dripping from anilox roll; – Emulsification/water streaks;

Excessive foam present in the printing unit, tray or ink pump unit. Causes: Incorrect solvent balance; Incorrect pH or viscosity; A one to one roller ratio at speed; Ink pump

Irregular edges around a print, often undesirable marks made on the image’s trailing edges, generally caused by an excessive build-up of ink. Causes: – Incorrect pressure set up in printing

A print defect where an unwanted image appears, often as a dark line in a light or solid print area. Tracking occurs when two print stations, which are often next