View previous topic :: View next topic |
Author |
Message |
nurbo
Joined: 23 Sep 2008
Posts: 457
Location: Lancashire
![Access to the FMF Gallery title=](templates/FabreMinerals/images/Foro2FMFGallery.jpg)
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: Apr 30, 2012 00:48 Post subject: Re: Repairing mineral specimens |
|
|
I guess ultimately its a very personal choice,and a kind of puritanical thing, though its all a question of scale, as soon as you collect a piece and remove it from its natural environment you are manipulating it, I think we all just have our own ideas about how much manipulation is allowed, as we all know when things come out of the ground they are often covered in mud, carbonates, rust or anyone of a number of other things which detract from the beauty of the specimen, do we leave them on there so as not to spoil the natural aesthetic of the piece? Of course not, we dump them in Oxalic or Dithionite or Super Iron out etc etc until we decide the specimen is ready for display. Repairing specimens is, in my opinion, an extension of the prepping process. Though as has already been said disclosure is essential. |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
Carles Millan
Site Admin
![](images/avatars/1012111894623d8778b127e.png)
Joined: 05 May 2007
Posts: 1474
Location: Catalonia
![Access to the FMF Gallery title=](templates/FabreMinerals/images/Foro2FMFGallery.jpg)
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: Apr 30, 2012 04:54 Post subject: Re: Repairing mineral specimens |
|
|
GneissWare wrote: | Heck, I have only been around 50+ years and I am showing wear and tear....I need a repair and restoration ;=)) |
Bob,
So if after repair you ever decide to put yourself on sale don't forget to make it clear in the label !
:-) |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
![Access to the FMF Gallery title=](templates/FabreMinerals/images/Foro2FMFGallery.jpg)
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: May 01, 2012 03:05 Post subject: Re: Repairing mineral specimens |
|
|
Buen dia Lluis
Keep on practicing your Afrikaans! I have learned a lot about repairing specimens from this discussions. I do not mind repaired specimens for my own collection, in fact, all specimens that I have repaired are in our own collection. I have never sold a repaired specimen (not to say I will never). As one gentleman noted, we (over 50's) have all somehow been repaired. A major problem with repairing comes when the main crystal is fitted the wrong way round or even worse, on a foreign matrix. Honesty is a rare element, far harder to find than the rarest of minerals! I have heard of local diggers that are also getting clever and 'repairing' or should I say 'fixing' crystals to get a better price. Thank goodness, I have never experienced that yet.
I cannot wait to see the notes on repairing minerals that Louis friend is planning to post.
Tener un buen dia _________________ Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
vicen
Joined: 25 Aug 2011
Posts: 20
Location: Edinburgh
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: May 03, 2012 09:52 Post subject: Re: Repairing mineral specimens |
|
|
Hi, I have been observing that the use of adhesives is quite commun, more than we think. I complitely agree with Alfredo and even I will add to his comment that the repairs should be done only when needed.
I have repaired quite a good number of minerals at the museum but only when needed for exhibitions or for resesearch. I normally use Paraloid B72, which I adore and know how to work with it. The adhesive is reversible with acetone, quite strong, and doesn't yellow. This adhesive has been used in the last 20 years in conservation and it is easy to use and no expensive. _________________ Geological Conservator/Preparator
Natural Sciences Department
National Museums Scotland
242 West Granton Road
Edinburgh EH5 1JA |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
Riccardo Modanesi
Joined: 07 Nov 2011
Posts: 620
Location: Milano
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: May 03, 2012 10:27 Post subject: Re: Repairing mineral specimens |
|
|
Hi to everybody!
According to Alfredo: I wonder why in Europe there are so few "repaired" minerals and in the US there are many more!
My opinion is based in two points:
i) it is useful to study repaired specimens as well, so that we can distinguish them from the "pure" specimens without needing a disclosure, as well as we do with synthetic or artificial materials (for example synthetic gemstones).
ii) however it is STRICTLY NECESSARY to have a full and complete disclosure about artificial treatments of minerals and gemstones, including repairing of a mineral! This is a treatment as well as heated amethysts which turned their colour into citrine or irradiated diamonds taking all of the colour you can imagine!
Greetings from Italy by Riccardo. _________________ Hi! I'm a collector of minerals since 1973 and a gemmologist. On Summer I always visit mines and quarries all over Europe looking for minerals! Ok, there is time to tell you much much more! Greetings from Italy by Riccardo. |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
Pierre Joubert
Joined: 09 Mar 2012
Posts: 1605
Location: Western Cape
![Access to the FMF Gallery title=](templates/FabreMinerals/images/Foro2FMFGallery.jpg)
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: May 03, 2012 10:27 Post subject: Re: Repairing mineral specimens |
|
|
vicen wrote: |
I have repaired quite a good number of minerals at the museum but only when needed for exhibitions or for resesearch. I normally use Paraloid B72, which I adore and know how to work with it. The adhesive is reversible with acetone, quite strong, and doesn't yellow. This adhesive has been used in the last 20 years in conservation and it is easy to use and no expensive. |
Thank you for that advice. I searched for Paraloid B72 and found this site quite useful conservationresources(.)com
I would appreciate some tips in using this adhesive. Regards _________________ Pierre Joubert
'The tree of silence bears the fruit of peace. ' |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
vicen
Joined: 25 Aug 2011
Posts: 20
Location: Edinburgh
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: May 09, 2012 06:25 Post subject: Re: Repairing mineral specimens |
|
|
Dear all,
Paraloid B-72 is being well studied in the last 20 years or so. I have included some files that can be of interest to you. Even if the articles are for fossils or archaeology, you can use the same techniques used and will help you to understand how the adhesive works.
There is a new article that will be published soon on SPNHC called: "Paraloid B72: Practical tips for the vertebrate fossil preparators" by A. Davidson and G. W. Brown, that will be of great help.
Hope it makes sense,
Vicen _________________ Geological Conservator/Preparator
Natural Sciences Department
National Museums Scotland
242 West Granton Road
Edinburgh EH5 1JA |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
vicen
Joined: 25 Aug 2011
Posts: 20
Location: Edinburgh
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: Jun 13, 2012 10:30 Post subject: Re: Repairing mineral specimens |
|
|
Have a look at this article which has just been out at
https://www.preplounge.blogspot.com
(link normalized by FMF)
Davidson, A. and G. Brown. 2012. Paraloid B-72: Practical tips for the vertebrate fossil preparator. Collection Forum 26(1--2):99-119
Vicen _________________ Geological Conservator/Preparator
Natural Sciences Department
National Museums Scotland
242 West Granton Road
Edinburgh EH5 1JA |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
rocknut
Joined: 01 Jul 2008
Posts: 12
Location: Suffolk
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: Jul 06, 2012 09:00 Post subject: Re: Repairing mineral specimens |
|
|
I've got a lovely quartz with a small nick in the termination.
Would smoothing the abrasion look natural and does this type of repair fall into the same category as using glue to repair broken crystals?
In both cases the goal is to restore the mineral.
I'm not interested in selling the specimen and if I ever did I'd disclose the repair.
Thanks,
Jeff |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
GneissWare
![](images/avatars/8727316649468aef7c338.jpg)
Joined: 07 Mar 2008
Posts: 1287
Location: California
![Access to the FMF Gallery title=](templates/FabreMinerals/images/Foro2FMFGallery.jpg)
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: Jul 06, 2012 09:59 Post subject: Re: Repairing mineral specimens |
|
|
Just my opinion....
Grinding a face to remove a nick is much worse that using glue to restore a crystal back onto a specimen. The first is an act of manufacturing, whereas the second is a restoration or repair. The first is not reversible, whereas the second activity is reversible.
Some dealers will use a colored epoxy to fill in chips on a crystal. There is nothing in my opinion wrong with this practice if (1) it remedies a flaw that is very distracting, (2) is fully disclosed, and (3) is reversible. |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
Tracy
![](images/avatars/8707469394870ee99161fc.jpg)
Joined: 15 Sep 2006
Posts: 551
Location: Toronto
![Access to the FMF Gallery title=](templates/FabreMinerals/images/Foro2FMFGallery.jpg)
![View user's profile View user's profile](templates/FabreMinerals/images/lang_english/icon_profile.gif)
![Send private message Send private message](templates/FabreMinerals/images/lang_english/icon_pm.gif)
|
Posted: Jul 06, 2012 11:01 Post subject: Re: Repairing mineral specimens |
|
|
I was thinking the same thing. in one case you are restoring a specimen to what it once was, in the other you are altering the crystal from its original form.
- Tracy _________________ "Wisdom begins in wonder" - Socrates |
|
Back to top |
|
![](templates/FabreMinerals/images/spacer.gif) |
|