Answered By: Beth Hylen Last Updated: Jan 09, 2017 Views: 106
The film you describe is caused by the atmospheric deterioration of glass, known as "crizzling" or glass disease.
A few pages from Stephen P. Koob's book, Conservation and Care of Glass Objects, 2006, pp. 117-120 are very relevant. Koob explains why some glass crizzles and describes the initial stages in these pages.
I checked with Mr. Koob (who is our Conservator at CMoG). He added that we don’t use the word “oily”, but “slippery, slimy" feel. "It’s the alkali leaching out, so it’s slippery like soap (another alkali)."
Please let me know if you have additional questions.
If you wish to obtain copies of any of the items in our bibliographies, please contact your local library or visit us. We encourage you to call ahead to let us know when you plan to arrive/visit and your area of interest. While an appointment is not required for use of the library, it will help us to be better prepared to meet your research needs and to have preliminary materials ready upon your arrival. Please contact us at 607-974-8649 or firstname.lastname@example.org. You may wish to browse the library collections using the "Rakow Library Catalog" and "Article Index" databases at http://rakow.cmog.org.
Additionally, the Rakow Research Library is a member of the Online Computer Library Center (OCLC); your local library can contact us through OCLC or they may mail an Interlibrary Loan form to us. You may request up to five items at a time. We send photocopies of articles and microfiche copies of our books (if they have been microfilmed) through Interlibrary Loan for four weeks use. Please don’t hesitate to contact us with any additional questions.