[meteorite-list] Widmanstattan pattern

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From: Matson, Robert <ROBERT.D.MATSON_at_meteoritecentral.com>
Date: Thu Apr 22 10:04:48 2004
Message-ID: <AF564D2B9D91D411B9FE00508BF1C86901B4E148_at_US-Torrance.mail.saic.com>

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Hi Rex,

The Hartmans can probably offer you the best advice on this. I can
answer a few of your questions though:

> 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?

600 is not enough. I think you need to go at least 1200, or even 1500.

> Ive also tried using ferric chloride but it seems worse. ...
> Using the ferric chloride as the latter makes the pattern jump out but
> then disappears behind a haze of oxidation.

Ferric chloride is VERY fast acting. You typically need to rinse it off
in less than 10 seconds, though it really depends on the effect you're
trying to achieve. I have a Campo slice that needed re-etching (after
I de-rusted it). I decided to go the ferric chloride route, and it looked
pretty good after only about 8 seconds.

Best,
Rob

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<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=380401005-14052002>Hi
Rex,</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=380401005-14052002></SPAN></FONT> </DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=380401005-14052002>The
Hartmans can probably offer you the best advice on this.  I
can</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN class=380401005-14052002>answer
a few of your questions though:</SPAN></FONT></DIV>
<DIV><FONT color=#0000ff face=Arial size=2><SPAN
class=380401005-14052002></SPAN></FONT> </DIV>
<DIV><FONT size=2><FONT face=Arial><FONT color=#0000ff><SPAN
class=380401005-14052002>> </SPAN></FONT>How important is the finish? I've
sanded down to a 600 grit. Is this enough,<SPAN class=380401005-14052002><FONT
color=#0000ff> </FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN class=380401005-14052002><FONT
color=#0000ff>></FONT> </SPAN>or should I polish it to a high
luster?<SPAN class=380401005-14052002><FONT
color=#0000ff> </FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN
class=380401005-14052002></SPAN></FONT></FONT> </DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN class=380401005-14052002><FONT
color=#0000ff>600 is not enough.  I think you need to go at least
1200, or even 1500.</FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN
class=380401005-14052002></SPAN></FONT></FONT> </DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN class=380401005-14052002><FONT
color=#0000ff>></FONT></SPAN> Ive also tried using ferric chloride but it
seems worse.<SPAN class=380401005-14052002><FONT color=#0000ff> 
...</FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN class=380401005-14052002><FONT
color=#0000ff>></FONT> </SPAN>Using the ferric chloride as the latter
makes the pattern jump out but<SPAN class=380401005-14052002><FONT
color=#0000ff> </FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN class=380401005-14052002><FONT
color=#0000ff>></FONT></SPAN> then disappears behind a haze of
oxidation.<SPAN class=380401005-14052002><FONT
color=#0000ff> </FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN
class=380401005-14052002></SPAN></FONT></FONT> </DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN class=380401005-14052002><FONT
color=#0000ff>Ferric chloride is VERY fast acting.  You typically need to
rinse it off</FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN class=380401005-14052002><FONT
color=#0000ff>in less than 10 seconds, though it really depends on the effect
you're</FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT face=Arial><SPAN class=380401005-14052002><FONT
color=#0000ff>trying to achieve.  I have a Campo slice that needed
re-etching (after</FONT></SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff face=Arial><SPAN
class=380401005-14052002>I de-rusted it).  I decided to go the ferric
chloride route, and it looked</SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff face=Arial><SPAN
class=380401005-14052002>pretty good after only about 8
seconds.</SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff face=Arial><SPAN
class=380401005-14052002><BR>Best,</SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff face=Arial><SPAN
class=380401005-14052002>Rob</SPAN></FONT></FONT></DIV>
<DIV><FONT size=2><FONT color=#0000ff face=Arial><SPAN
class=380401005-14052002></SPAN></FONT></FONT> </DIV></BODY></HTML>

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Received on Tue 14 May 2002 01:10:05 AM PDT

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