A quality control term regarding the spots of ink color on the tail of a sheet. Basically a color test strip, which is printed on the waste portion of a press sheet. It is a standardized process which allows a pressman to determine the quality of the printed material relative to ink density, registration, and dot gain. It also includes the Star Target, which is a similar system designed to detect inking problems.
A series of ink patches printed on a press sheet that may include solids of cyan, magenta, yellow, black, and spot colour ink; 25%, 50%, and 75% tints of those colours; and two-colour overprints using those colours.