Input-output norms for optical brightener require specified input proportions and verification that imports are used in export production.

Standard input output norms prescribe constituent raw materials and specific proportional quantities per kilogram for Optical Brightener Agent C.I. Fluorescent Brightener 252 (Assay 33%), with the entry noted as suspended; applicants must ensure imported goods correspond to those actually used or required in the export product, establishing an import use verification obligation.

---

---

---