Smithsonian workshop to feature NCPTT research Posted by NCPTT On February 1, 2009 · In All, Cemetery Conservation, Events, News, Training Cleaning a headstone NCPTT’s comparative research on cleaners for cemetery headstones will be featured as part of the Smithsonian Museum Conservation Institute’s workshop on microbial colonization of stone. The workshop will be held April 20-22, 2009 in Washington, DC. Share on FacebookShare on Twitter Tagged with → Biological Growth • Cemeteries • cemetery • Museum • Smithsonian • Stone • Training • Washington DC