The Leverhulme-funded Network for the Study of Dispersed Qumran Cave Artefacts and Archival Sources has initiated scientific testing of a deposit found inside the lid of a Qumran-type jar lid, now in a private collection. This lid was purchased in 1962 by John Allegro from the antiquities dealer Kando in Bethlehem, and exported under license. This has been verified through records documenting the acquisition of the object, and these will be presented and then published together with the lid. In 2016 a sample of the lid deposit was extracted and sent for analysis at Quest (Quartenary Scientific), within the School of Archaeology, Geography and Environmental Science at the University of Reading, UK. The important results of this analysis will be presented in this paper. *This paper is co-authored with Joan Taylor (King's College London)and Marcello Fidanzio (Facoltà di Teologia di Lugano).