This standard specifies the requirements, sampling, test methods, inspection rules and signs, labels, packaging, transportation and storage of fluorescent whitening agent VBL (CI fluorescent whitening agent 85). This standard applies to the quality inspection of fluorescent whitening agent VBL products, which are mainly used for whitening bleached cotton fabrics, pulp fibers, etc., and brightening printed cotton fabrics. Molecular formula: C36H34O8N12S2Na2 Relative molecular mass: 872.85 (according to 1997 international relative atomic quality)