This is the multi-year Q&A sessions held by D&D co-creator Gary Gygax here at EN World, beginning in 2002 and running up until his sad pasing in 2008. Gary's username in the thread below is Col_Pladoh, and his first post in this long thread is Post #39.
		
		
	
	
		 
	
				
			 
				 
		 
		 - and that cold-pressed (ie stamped) ironware was said to be inimical to fairies, as a sign of encroaching mundanity and modernity.  But while you might have a stamped-iron box or broach, it's not practical for weapons.  3e/WotC ended up making "cold iron" basically a rare, magical, mithril-ish sort of stuff, the reverse of the cold-pressed iron myth.
 - and that cold-pressed (ie stamped) ironware was said to be inimical to fairies, as a sign of encroaching mundanity and modernity.  But while you might have a stamped-iron box or broach, it's not practical for weapons.  3e/WotC ended up making "cold iron" basically a rare, magical, mithril-ish sort of stuff, the reverse of the cold-pressed iron myth. 
 
		 
  
 
		 
 
		 
 
		 
 
		 
 
		 
 
		