Hello Marcin, Very unusual to see. With no knowledge on this subject, i'll try at a Possible "solution" (no pun intended)...........
If, if, as you say, all slices were prepared the same and no other coating was left on on the piece(s) that wouldn't take the etch---is it Possible that they may have somehow become electomagnetically charged (preventing the chemical bond) and the piece you used to scratch the object piece broke/relieved this charge in order for the solution to begin its work?? Mirko? All best, John ----- Original Message ----- From: "PolandMET via Meteorite-list" <[email protected]> To: <[email protected]> Sent: Tuesday, August 25, 2015 4:57 PM Subject: [meteorite-list] Unusual phenomen during etching iron meteorites Dear meteorite friends. Tooday I etched some Maslyanino slices and beetween 10 of them, two slices do not want start etching. I was able to capture this very strange phenomen with my macro lens. I cant explain this. Maybe someone can ? Let me explain whats going on here. Normaly, when slice is placed in etching solution, etching starts immediately in the same second. But rarely, I can keep slice even 5 or 10 minutes without any signs of etching. On this video, there is one of 10 slices of Maslyanino that comes from same slice divided to smaller specimens, so material was prepared 100% the same. Only two of this 10 slices can't be etched in normal way. They need a starter. This mean I need to scratch them with other slice to start etching. This is visible at 1:40 when I finally use correct slice to start etch reaction. You can see then how solution move from the place of scratch in all direction and etching starts immediatelly. https://www.youtube.com/watch?v=Sd9s56NuTVQ&feature=youtu.be -----[ MARCIN CIMALA ]-----[ I.M.C.A.#3667 ]----- http://www.Meteoryty.pl marcin(at)meteoryty.pl http://www.PolandMET.com marcin(at)polandmet.com http://www.Gao-Guenie.com GSM: +48 (793) 567667 --------[ Member of Polish Meteoritical Society ]-------- ______________________________________________ Visit our Facebook page https://www.facebook.com/meteoritecentral and the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list [email protected] https://pairlist3.pair.net/mailman/listinfo/meteorite-list ______________________________________________ Visit our Facebook page https://www.facebook.com/meteoritecentral and the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list [email protected] https://pairlist3.pair.net/mailman/listinfo/meteorite-list
