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	Product: Sodium 2,3-dihydroxyl naphthalene-6-sulfonate (Dihydroxyl R Salt)  
	CAS NO: 135-53-5 
	Molecular formula:   C10H7NaO5S  
	Structure formula:  
	  
	Properties: 
	Grey white powder. 
	Application:  
	Mainly used as coupling agent for diazo photosensitive paper, also used as food additive, etc. 
	Specification: 
	
		
			| 
					Items | 
					Quality |  
			| 
					Purity,% | 
					99 min. |  
			| 
					Moisture,% | 
					0.5 max. |  
	  |