TAPPI UM 658 2010

A TAPPI Useful Method for evaluating the comparative color strength and shade of dyes and pigments used in paper coloring.

TAPPI UM 658 2010 provides laboratory procedures for comparing the color strength and shade of dyes and pigments against a standard dye. It covers Method A for soluble dyes used in calender staining and surface coloring, and Method B for soluble and insoluble colorants used in beater applications. The document includes sampling guidance, required apparatus and reagents, dye solution preparation, testing procedures, handsheet formation and drying, visual evaluation, reporting requirements, precision guidance, and notes on alternative evaluation techniques. It is intended for paper manufacturers, dye suppliers, laboratory technicians, and quality professionals performing comparative color evaluations.

Application Scope: Laboratory assessment of dye and pigment color strength and shade for paper coloring, including surface-coloring and beater-dyeing applications.