Abstract
AbstractTheft of archival documents constitutes a serious problem for archives. A possible solution to this problem lies in labelling these documents with codes that are invisible to the naked eye. A possible method could involve use, e.g. of the oxides of lanthanum, dysprosium, samarium, gadolinium and niobium, which have good responses in the XRF spectrum and are normally not present in archival materials. This study is concerned with the impact of these oxides on the properties of lignocellulosic materials. The identification tags were printed on three different kinds of paper supports (Whatman No. 1 filter paper, paper according to ISO 9706 and sulphite pulp). The colour change, average degree of polymerisation, the pH values of an aqueous extract and selected mechanical properties after application of the tag and artificial ageing were studied on all the samples. The measurements showed that the studied oxides do not have a negative effect on the monitored properties of the paper supports and do not affect their long-term ageing behaviour.
Highlights
IntroductionTheft of archive documents and rare copies of books (e.g. manuscripts or incunabula) is a problem for archives and libraries
Theft of archive documents and rare copies of books is a problem for archives and libraries
The identification tags were printed on three different kinds of paper supports (Whatman No 1 filter paper, paper according to ISO 9706 and sulphite pulp)
Summary
Theft of archive documents and rare copies of books (e.g. manuscripts or incunabula) is a problem for archives and libraries. This work is licensed especially archive institutions, the theft of archival materials constitutes a serious security risk. If the stolen documents are found and the perpetrator is caught and charged, it is very difficult to demonstrate ownership if the documents are not labelled. Usual current practice in archives and similar institutions is to label documents with the imprints of metal or rubber stamps with the necessary information. This procedure is cheap and undemanding on time and technology, but the tag is visible and reduces the aesthetic value of the document. In the past few years, other methods of designation are being sought that would remedy these inadequacies
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