GB/T 2387-2013 "Determination of Color Shade and Strength of Reactive Dyes" is applicable to the determination of color shade and strength of various reactive dyes, including X-type, KN-type, and K-type. The standard specifies that the test sample and the reference sample are dyed simultaneously on cellulose fibers. The dyeing process requires instruments such as laboratory dyeing machines, two-roll padding mangles, and steaming machines, with strict control over dyeing conditions. The final evaluation is based on the reference sample, with results assessed through visual or instrumental measurement comparisons, providing technical specifications for the production inspection and application of reactive dyes.