Re: [ARSCLIST] CD-ROM marking pens

[Richard Warren <richard.warren@xxxxxxxx>]

Hi Folks,

I'm no chemist either, but reading and experience with painting and such 
have taught that alcohol is THE most common SOLVENT for lacquer (just try 
cleaning a standard 78-rpm disc with alcohol, remembering that shellac is 
only one ingredient in 78-rpm discs' "shellac."

Richard

At 08:54 AM 11/18/2005, you wrote:
> Here is a link to the Sharpie(R) site about their new "CD/DVD" pen:
>
> http://www.sharpie.com/sanford/consumer/sharpie/productcatalog/tipfamily
> detail.jhtml?attributeId=SNATT_SUP_9200035&currentType=SNTYPE004
>
> FYI, they don't say what the ink/dye formulation is for this new pen;
> just that it is "specially formulated for digital media surfaces..."
>
> The Sharpie (R) Twin-Tip Marker composition is "Dyes,
> n-propanol(71-23-8), n-butanol(71-36-3), diacetone alcohol(123-42-2)."
> http://www.sharpie.com/sanford/consumer/sharpie/productcatalog/tipfamily
> detail.jhtml?attributeId=SNATT_SUP_9200035&currentType=SNTYPE004
>
> I'm no chemist, but that doesn't sound good for CDR media. We presently
> use the Staedtler Lumocolor CD-R pen:
> http://www.staedtler-usa.com/Lumocolor_cd_dvd_pen_us.Staedtler?ActiveID=
> 24387
>
>
> John Bondurant
> Sound Preservation & Access Assistant
> Appalachian Sound Archive
> Berea College
> CPO LIB
> Berea, KY 40404
>
> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:ARSCLIST@xxxxxxx] On Behalf Of Mike Richter
> Sent: Thursday, November 17, 2005 8:22 PM
> To: ARSCLIST@xxxxxxxxxxxx
> Subject: Re: [ARSCLIST] CD-ROM marking pens
>
> Jerome Hartke wrote:
> > Solvent-based inks, such as used in the Sharpie, can penetrate the
> > protective layer on the label surface of CD discs. The formulation of
> this
> > layer varies; some being more resistant to solvents than others. I am
> glad
> > that you have been lucky, but do not recommend use of such pens on
> discs
> > that are not easily replaceable.
> >
> > Jerry
> > Media Sciences, Inc.
>
> Sanford, makers of the Sharpie, agree with you. They make pens with
> water-based inks which they recommend instead. I've not found them for
> sale and have not tried them.
>
> There have been reports of failure due to the Sharpie and other
> unapproved pens. Note that not only the solvent but also the pigment may
>
> be a problem. RCA discovered that when they had to replace thousands of
> copies of a set of CDs.
>
> Mike
> --
> mrichter@xxxxxxx
> http://www.mrichter.com/