This standard specifies the requirements, sampling, test methods, inspection rules and signs, labels, packaging, transportation and storage of the optical brightener CXT (CI optical brightener 71). This standard applies to the fluorescent whitening agent CXT, which is condensed from cyanuric chloride, 4,4-diaminostilbene-2,2-disulfonic acid, aniline and morpholine. This product is mainly used for synthetic detergents. agent, cotton fiber and fabric whitening.