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	Product:  Sodium 2,7-dihydroxyl naphthalene-3,6-disulfonate  
	CAS NO: 7153-21-1 
	Molecular formula:   C10H6Na2O8S2 
	Structure formula:  
	 
	Properties: 
	Caesious powder. 
	Application:  
	Used as blueprint coupling ingredient 
	Specification: 
	
		
			| 
					Items | 
					Quality |  
			| 
					Purity,% | 
					97 min. |  
			| 
					Moisture,% | 
					1 max. |  
	  |