This standard provides techniques for detecting the uniformity of solid composition of traffic coatings by Light spectrum method and gas phase Chromatography. Test methods include comparing the Light spectrum or Chromatographic peak of a sample with a reference sample to detect potential adulteration or inhomogeneity. Method A is used for preliminary detection, Methods B and C for more detailed adulteration detection, while Method D provides quantitative analysis. Suitable for assessing the uniformity of paints and detecting adulteration or changes in composition.