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					Originally Posted by thomas hauschild
					
				 Water and some spoons of instant coffee. It is a very slow etching. You can put a blade in for some hours without a big risk to remove too much steel. But it will etch to a deep black and you can feel a structure after a day on damascus blades. 
 Best Thomas
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 Very, very interesting! Definitely worth a try.
Thank you!  
