[meteorite-list] Widmanstattan pattern
From: wrecks463 <wrecks463_at_meteoritecentral.com>
Date: Thu Apr 22 10:04:48 2004 Message-ID: <001a01c1fb04$14b483a0$cca40044_at_tc.ph.cox.net> This is a multi-part message in MIME format. ------=_NextPart_000_0017_01C1FAC9.6801BF40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello People, I have a few questions on etching meteorites. Is there a temperature at which the Widmanstattan pattern is ruined? = If it turns blue does this mean its pretty much over?=20 How important is the finish? I've sanded down to a 600 grit. Is this = enough,or should I polish it to a high luster? I dont have any lapidary = equiptment and sanding disks only go down to 80 grit. How precise does the acid/alcohol ratio have to be? I've tried to = match the instructions in Mr. Nortons book,but am not satisfied with the = results. Ive also tried using ferric chloride but it seems worse. I've = tried starting out with the nitric acid/alcohol mixture and finishing up = with the ferric chloride and vica versa. Using the ferric chloride as = the latter makes the pattern jump out but then disappears behind a haze = of oxidation. All of the systems I try end up with a dark haze of oxide = that ruins everything. Can anybody help me out here? This is all from a = 30 pound Campo that I sliced down to a 20 pounder. Could these problems = be just because it is a Campo? There never was much rust on it to begin = with,so I dont know. Although the 20 pounder makes a great door stop I = need to figure out what to do with these slices.My way isn't working. Any helpfull tips would be greatly appreicieated. Thanks in advance, Rex ------=_NextPart_000_0017_01C1FAC9.6801BF40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2600.0" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Hello People,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2> I have a few questions on = etching=20 meteorites.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2> Is there a temperature at = which the=20 Widmanstattan pattern is ruined? If it turns blue does this mean = its=20 pretty much over? </FONT></DIV> <DIV><FONT face=3DArial size=3D2> How important is the = finish? I've=20 sanded down to a 600 grit. Is this enough,or should I polish it to a = high=20 luster? I dont have any lapidary equiptment and sanding disks only go = down to 80=20 grit.</FONT></DIV> <DIV><FONT face=3DArial size=3D2> How precise does the = acid/alcohol ratio have=20 to be? I've tried to match the instructions in Mr. Nortons book,but am = not=20 satisfied with the results. Ive also tried using ferric chloride but it = seems=20 worse. I've tried starting out with the nitric acid/alcohol mixture = and=20 finishing up with the ferric chloride and vica versa. Using the ferric = chloride=20 as the latter makes the pattern jump out but then disappears behind a = haze of=20 oxidation. All of the systems I try end up with a dark haze of oxide = that ruins=20 everything. Can anybody help me out here? This is all from a 30 pound = Campo that=20 I sliced down to a 20 pounder. Could these problems be just because it = is a=20 Campo? There never was much rust on it to begin with,so I dont know. = Although=20 the 20 pounder makes a great door stop I need to figure out what to do = with=20 these slices.My way isn't working.</FONT></DIV> <DIV><FONT face=3DArial size=3D2> Any helpfull tips would be = greatly=20 appreicieated.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2> Thanks = in=20 advance,</FONT></DIV> <DIV><FONT face=3DArial=20 size=3D2> &nbs= p; =20 Rex</FONT></DIV></BODY></HTML> ------=_NextPart_000_0017_01C1FAC9.6801BF40-- Received on Tue 14 May 2002 12:59:08 AM PDT |
 StumbleUpon del.icio.us reddit Yahoo MyWeb
|