Barr is the optical result of physical or dye differences in the yarns, geometric differences in the fabric structure, or any combination of these differences. This test method provides a standard procedure for evaluating barr intensity and for describing pattern characteristics based on visual comparison to a Uniformity Reference Scale and description of the barr pattern using a standard terminology. It can be used with knitted fabrics, woven fabrics and garments. The standard terminology is particularly useful in oral and written communications.