<div dir="ltr">Hi Kayla, <div><br></div><div>Joachim beat me to a response! High tack fish glue is great, and Paraloid B-72 is an extremely versatile adhesive that we use frequently in objects conservation.
The one thing I want to add to his information is that Paraloid B-72 can be reversible using the same solvents. Sometimes it takes a longer dwelling time, but if the bones are placed in an acetone chamber, it should do the trick to release the adhesive. I've performed that trick many times on objects, particularly ceramic pieces. If anyone has further questions on this, don't hesitate to reach out. </div><div><br></div><div>You can buy Paraloid B-72 premade in little containers that look like nail polish containers. This makes it very easy to use and apply. The solution is 20% in acetone, which might be a little dilute for your purposes (this is ideal for consolidating areas, as Joachim mentioned, and also for labeling objects). To thicken, you could keep the lid off of the container for a few minutes to allow the acetone to evaporate. Conversely, if it becomes too thick or stringy, you can add drops of acetone and wait a bit for it to dissolve, creating a less viscous solution. </div><div><br></div><div>In the States, it's available <a href="https://museumservicescorporation.com/products/marking-varnishes">here</a> and <a href="https://www.talasonline.com/Paraloid-B-72-Lacquer">here</a>. And as he explained, you can make your own solutions in glass jars (with a well-gasketed lid) by buying your own pellets. They are available <a href="https://www.talasonline.com/Paraloid-B-72">here</a>. If you would like more step-by-step on how to make it, I'd be happy to walk you through it. I just gave a presentation during this past SPNHC meeting on the exact topic. </div><div><br></div><div>I also strongly advise against superglue, as well as anything used in the human dental industry. </div><div><br></div><div>Best,</div><div>Fran</div><div>Chair of the SPNHC Conservation Committee</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jul 25, 2023 at 2:47 AM Joachim Händel <<a href="mailto:Joachim.Haendel@zns.uni-halle.de">Joachim.Haendel@zns.uni-halle.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div><div id="m_-2006523651179098410GroupWiseSection_1690267395215_Joachim.Haendel@zns.uni-halle.de_659232D005F00000BEC929790EDC4731_">
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<p>Dear Kayla,</p>
<p>the question here is whether the bonding should be reversible or not.<br>For reversible bonding, I recommend fish glue - an excellent adhesive. It sticks strongly and dries quickly. You can dissolve the bond again with warm water.</p>
<p>For non-reversible bonding, I recommend Paraloid B72 dissolved in ethyl acetate or acetone. This can also be used to fill defects and consolidate crumbly parts.<br>If it is absolutely necessary, the adhesive can be dissolved again by soaking it in solvent for a longer period of time.</p>
<p>If necessary, nitrocellulose glue can also be used. However, it is not so durable and turns slightly yellow after a few years (decades).</p>
<p>I strongly advise against superglue, because you have to press the pieces together hard when gluing, which can damage the objects.<br>Moreover, you can never dissolve it again</p>
All the best</div>
<div>Joachim</div>
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<div><span style="color:rgb(148,148,148);font-family:Arial,sans-serif;font-size:small"> </span></div>
<div><span style="color:rgb(148,148,148);font-family:Arial,sans-serif;font-size:small">-- </span></div>
<div><span style="color:rgb(148,148,148);font-family:Arial,sans-serif;font-size:small">Joachim Haendel</span></div>
<div><span style="color:rgb(148,148,148);font-family:Arial,sans-serif;font-size:small"> </span></div>
<p><span style="color:rgb(148,148,148);font-family:Arial,sans-serif;font-size:small">Center of Natural History Collections<br>of the Martin Luther University (ZNS)<br>- Entomological Collection -<br><br>Domplatz 4<br>D-06099 Halle (Saale)<br>Germany<br><br>Phone: +49 345 - 55 26 447<br>Fax: +49 345 - 55 27 248<br></span></p>
<div><span style="color:rgb(148,148,148);font-family:Arial,sans-serif;font-size:small">Email: <a href="mailto:joachim.haendel@zns.uni-halle.de" target="_blank">joachim.haendel@zns.uni-halle.de</a></span></div>
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<div dir="ltr"><span><br>>>> Kayla Ott <<a href="mailto:kzott@ucsc.edu" target="_blank">kzott@ucsc.edu</a>> 24.07.2023, 23:24 >>><br></span>Hello everyone,
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<div>Does anyone have recommendations on the best glue to use to repair bone specimens that have been broken? Something that would work to repair teeth that have fallen out of mandibles, vertebral columns that have had some spinous processes broken off with use, etc.</div>
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<div>This is for specimens in our reference teaching collection for undergraduate zooarchaeology courses which students are very hands on with, so the more durable, the better.</div>
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<div>Thanks!<br clear="all">
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<div dir="ltr">Kayla Ott
<div>Pronouns: They/Them/Theirs</div>
<div>Laboratory Operations and Facilities Manager</div>
<div>Department of Anthropology</div>
<div>University of California, Santa Cruz</div>
<div>Phone: 831-459-1481</div>
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