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|  2nd August 2016, 11:54 AM | #1 | |
| Member Join Date: Aug 2014 Location: Germany 
					Posts: 525
				 |   Quote: 
 Hi Marious, it's a commercial link, so I decided, to send you a private message. If you use nitric, you have to use nitric with at least 65%, better 70% or more. This has nothing to do with the 2-4% you use for etching! This was a very important advise from an analytical chemist. Roland Last edited by Roland_M; 2nd August 2016 at 12:14 PM. | |
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