Diphenylamine-4-diazonium salt (Diazo S) CAS No.: 4477-28-5 Molecular Weight: 293 Molecular formula: C12H11N3O4S Specifications: Moisture: <0.5% Aspect: Yellow Powder Assay: 95%(min) Melting point: 168—170°C(dec) 2,3-Dihydroxynaphthalene-6-sulfonate (COUPLER 1) CAS No:135-53-5 USE It is mainly used as coupler for diazo photosensitive pater, It also used as additive off food colour and plating Content: 99% 98% 97% 90% 85% M.W: 262 Fe: 10PPM 20PPM 40PPM Aqueous solution: Light yellow transparent liquid PH value: 3-6 Organic impurity:<1% Storage: Stored in dark dry place for two years Appearance: White powder or crystal Sodium 2,7-dihydroxyl naphthalene-3,6-disulfonate (COUPLER 5) CAS No:7253-21-1 Molecular Formula: C10H6Na2O8S2 Uses: used as blueprint coupling ingredient. Content: ≥97% Molecular Weight: 364 Iron: 10PPM Moisture: 1% Appearance: cyan grey to greyish white powder 2,3-dihydroxyl Naphthalene (COUPLER 11) CAS No: 92-44-4 Molecular Formula: C12H12O2 Uses: used as dye and pharmaceutical intermediate,hair dye. Purity: 98% Molecular Weight: 160 Moisture: 1% Iron ion: 10PPM Melting Point: 162°C~164°C Appearance: greyish white or pinkish powder. Packing: export-level woven bag lined with plastic bag, net weight: 25kg or 50kg/bag.