Sounds like physical removal may be the only option unfortunately.

 

From: The Natural Science Collections Association discussion list [mailto:[log in to unmask]] On Behalf Of sam kerney
Sent: 18 May 2012 11:00
To: [log in to unmask]

Subject: Re: Chemical Removal of ink and paint

 

 

Most pens and paints of this fashion gain their fluorescence from heavy metals. If i was to run them in the ICP machines with these metals present, it would yield false heavy metal trends and throw off the chemostratigraphy. The final thesis will also be inference of the ancient ocean chemistry where the non-carbonate portion of these rocks will be extracted and analysed so any signature from the inks and paints could lead to incorrect conclusions.

 
Sam
 

---

Date: Fri, 18 May 2012 09:54:09 +0000
From: [log in to unmask]
Subject: Re: Chemical Removal of ink and paint
To: [log in to unmask]

Sam

 

Apart from being unsightly, why do these numbers and marks need to be removed at all? Your reasons are unclear to me.

 

With many markers used in dirty wet environments there is unlikely to be a simple solvent option as these are designed not to be soluble.

 

Nigel

 

 

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From: The Natural Science Collections Association discussion list [mailto:[log in to unmask]] On Behalf Of sam kerney
Sent: 18 May 2012 10:50
To: [log in to unmask]
Subject: Chemical Removal of ink and paint

 

Hi all,

I’m currently working with a geological collection of outcrop plugs at the University of Greenwich, and the company that supplied them was kind enough to label each of the 4200 samples with indelible markers and fluorescent pens. Sanding and filing is not really an option with such a large number as it would set the project back months. there’s also some issues with the nature of the samples. They are plugs from a carbonate platform. Eventually these will be powdered and used in an ICP-OES and ICP MS machine as well as XRD. Unfortunately these plugs are very small and being carbonates require double weight to run in the machines so simply cutting off the affected areas is not an option and almost every surface has been scribbled or painted on.



I’m looking for a way to chemically remove these inks and paints WITHOUT altering the chemical composition of the rock, as the project is about determining how the chemical composition effects mineralisation and supports the sequence stratigraphy. I have tried acetone but this has had little success and was wondering if anyone from NATSCA, particularly conservators or those with a geological background has encountered similar problems and how they went about treating the issue?



Any help would be greatly appreciated.
 
Sam Kerney
PhD student
Greenwich University at Medway
School of Science
Chatham
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