If anyone is interested in the technical side of modern and historical conservations techniques as they pertain to ferrous products, I'd highly recommend:  
 
Iron and Steel: Corrosion, Colorants, Conservation by David Scott 
 
 
An answer to M Eley, if I wanted to remove old pigments such as primers, I would begin with acetone. However, your mileage may vary. Cheers
		 
		
		
		
		
		
		
		
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