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Hessian crucible
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>"Scientists crack ancient crucible recipe". <a href="http://www.rsc.org/chemistryworld/News/2006/November/23110602.asp" target="_blank">http://www.rsc.org/chemistryworld/News/2006/November/23110602.asp</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"21st Century Technology Cracks Alchemists' Secret Recipe". <a href="https://www.sciencedaily.com/releases/2006/11/061123120134.htm" target="_blank">https://www.sciencedaily.com/releases/2006/11/061123120134.htm</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>