Methods of making a master and replicas thereof

A method of making a master by forming three sets of V-shaped grooves in a substrate such that the intersections form an array of cube-corner elements;

• wherein the grooves in each set are formed with a groove position precision ranging from about ±10 nm to about ±500 nm for a distance of 10 consecutive grooves and at least every 10th groove in at least one of the three sets is varied from an adjacent parallel groove by a magnitude ranging from about 15 nm to about {fraction (1/10)}th of the average groove spacing.

A method of making a master by forming cube-corner elements;

• wherein the elements have a lateral dimension in plan view from 0.0005 inches (0.0127 mm) to 0.007 inches (0.1778 mm) throughout the array and at least 10% of neighboring cubes are formed such that the cubes are randomly shifted such that light retroreflected by the cubes is shifted phase by at least {fraction (1/10)}th of a wavelength of visible light.

A method of making a reflective sheeting comprising:

• a) providing a tooling that would result in the occurrence of a moiré-like pattern;
• b) tiling one or more tooling such that each tile is less than about ¼ inch (6.35 mm) in at least one dimension.

Retroreflective sheeting comprising a polymeric sheet having an array of cube-corner elements, the elements formed from three sets of parallel intersecting V-shaped grooves, wherein the grooves in each set are formed at a position having an average groove spacing ranging from 0.0005 inches (0.0127 mm) to 0.007 inches (0.1778 mm) and the groove position of at least every 10th groove in at least one of the three sets differs from an adjacent parallel groove by a magnitude ranging from about 50 nm to about {fraction (1/10)}th of the average groove spacing.

Retroreflective sheeting comprising a polymeric sheet having an array of cube-corner elements interconnected by a continuous land layer, the elements formed from intersecting V-shaped grooves, wherein the grooves have an average groove spacing ranging from 0.0005 inches (0.0127 mm) to 0.007 inches (0.1778 mm) and the sheeting is substantially free of a moiré-like pattern.