On Wed, 16 May 2007 03:15:42 -0400, Jean-Pierre Baconnet wrote: > Thank you Bill for all this stuff. > > What could help, really, would be to have the exact proportion of C in the > wires, snip > But may be it's a dream ! there actually is quite a bit on the various products. In particular, Marc Vogel provides a data sheet with all that and much more. Each and every batch is individually tested they claim. you can get this from their site: http://www.vogel-scheer.de/pdf%20Vogel/News-Westf%8alischesEisen.pdf http://www.vogel-scheer.de/pdf%20Vogel/News-Vergleich_Eisen.pdf the Vergleich lists many different Fe wires then there are their brass files: http://www.vogel-scheer.de/pdf%20Vogel/News-StolbergMessing.pdf http://www.vogel-scheer.de/pdf%20Vogel/News-FreibergerGelbmessing.pdf http://www.vogel-scheer.de/pdf%20Vogel/News-KupferhofRotmessing.pdf http://www.vogel-scheer.de/pdf%20Vogel/News-Vergleich_Messing.pdf b