<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="Generator" content="Microsoft Word 15 (filtered medium)">
<style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Georgia;
panose-1:2 4 5 2 5 4 5 2 3 3;}
@font-face
{font-family:"Segoe UI";
panose-1:2 11 5 2 4 2 4 2 2 3;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0in;
mso-margin-bottom-alt:auto;
margin-left:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Georgia",serif;
color:windowtext;}
span.EmailStyle19
{mso-style-type:personal-compose;
font-family:"Georgia",serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri",sans-serif;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang="EN-US" link="blue" vlink="purple">
<div class="WordSection1">
<p class="MsoNormal"><span style="font-family:"Georgia",serif">Dear Cory,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">Here is what our conservator has to say, hope it is helpful.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif">Genevieve<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><o:p> </o:p></span></p>
<p class="MsoNormal">This acrylic resin is soluble in mineral spirits if the solvent contains a fractional aromatic content (xylene or toluene). Hardware store VM&P Naptha is not always<o:p></o:p></p>
<p class="MsoNormal">up to grade for preparing solutions of B-67 as a barrier coating. L<u>aboratory grade</u> solvents are a better choice.
<i>Fisher Scientific </i>or <i>VWR</i> or <i>Museum Services Corporation </i>are sources.<o:p></o:p></p>
<p class="MsoNormal">Cory Redman might try adding a small amount of isopropanol or acetone or xylene to his solutions to see if the gooey mass dissipates. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><a href="https://conservationsupportsystems.com/main">ConservationSupportSystems</a> :<o:p></o:p></p>
<p class="MsoNormal"><b><span style="font-size:12.0pt">Paraloid B-67</span></b><o:p></o:p></p>
<p class="MsoNormal">RECOMMENDED SOLVENTS: Shell Mineral Spirits 135, Shell M/S 145, Shell Sol 71, Shell Sol 340, Shell Sol 100, Xylene and Toluene.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal">Scott<o:p></o:p></p>
<p class="MsoNormal"><b><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#548DD4"><o:p> </o:p></span></i></b></p>
<p class="MsoNormal"><b><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#548DD4">Scott E. Fulton<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#548DD4">Conservator, Ware Collection of Blaschka Glass Models of Plants<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#548DD4">Harvard University Herbaria<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#548DD4">22 Divinity Avenue<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#548DD4">Cambridge, MA 02138<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#548DD4"><o:p> </o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:#548DD4">617-496-6183<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:gray"><a href="mailto:sfulton@fas.harvard.edu">sfulton@fas.harvard.edu</a><o:p></o:p></span></i></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif;color:#7F7F7F;background:white">=================================================</span><span style="font-family:"Georgia",serif;color:#7F7F7F"><br>
<span style="background:white">Genevieve E. Tocci (she, her, hers)</span><br>
<span style="background:white">Senior Curatorial Technician</span><br>
<span style="background:white">Harvard University Herbaria</span><br>
<span style="background:white">22 Divinity Ave., Cambridge, MA 02138 U.S.A.</span><br>
<span style="background:white">Phone: 617-495-1057 Fax: 617-495-9484</span><br>
<span style="background:white">glewis-g@oeb.harvard.edu</span></span><span style="font-family:"Georgia",serif;color:#7F7F7F"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Georgia",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><b>From:</b> Nhcoll-l <nhcoll-l-bounces@mailman.yale.edu> <b>
On Behalf Of </b>Cory Redman<br>
<b>Sent:</b> Tuesday, January 7, 2020 12:10 PM<br>
<b>To:</b> nhcoll-l@mailman.yale.edu<br>
<b>Subject:</b> [Nhcoll-l] Paraloid B-67 in naphtha....<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div>
<p class="MsoNormal">I have tried dissolving Paraloid B-67 in naphtha and mineral spirits that were purchased from a local hardware store with no success. The B-67 has just turned into a large gooey mass at the bottom of the container and no amount of agitation
or time (going on 4+ weeks) seems to help. What am I doing wrong?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">I am very familiar working/mixing Paraloid B-72 in acetone or ethanol, but this is my first time using B-67 and yes, I need to use B-67 in naphtha for the objects being numbered.
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">I would appreciate some help/tips/guidance. I haven't been able to find anything in the literature, but I probably am missing a key paper(s). <o:p></o:p></p>
</div>
<div>
<div>
<div>
<p class="MsoNormal"><br>
-- <o:p></o:p></p>
<div>
<div>
<div>
<div>
<p class="MsoNormal">Cory M. Redman (BSc; MSc; PhD)<br>
Science Curator<br>
Grand Rapids Public Museum<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">272 Pearl Street NW <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Grand Rapids, MI 49504 <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__www.grpm.org&d=DwMFaQ&c=WO-RGvefibhHBZq3fL85hQ&r=EYdhJ0HrhAMcA2aVQ-I4N7lml00zxsXPbHYeP7843No&m=ospwV_PkDvU7wXAiH619X54uU3iHdhsQ32xMZR25vx0&s=mZ75wb8ubsjMZ2czVN2cczzdhQzbBP07yoXBYXuMc98&e=" target="_blank">www.grpm.org</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">office: 616:929:1766<o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>