GB/T 43108-2023 specifies the weighting method and photometric method for determining the solubility of dyestuff in organic solvents. The standard specifies the accuracy requirements of the required instruments, such as Balance, spectrophotometer, etc. The operation process of the two methods is described in detail. The weighting method covers solvent selection, dyestuff dissolving, filtrate weighing and other steps; the photometric method includes solution preparation, Absorbance determination, etc. Through this standard, the solubility of dyestuff in different organic solvents can be accurately determined, providing key data for dyestuff production, printing and dyeing process formulation and related Product Research & Development, and helping to optimize the use effect of dyestuff.