sentences:  Shortly before the Raman analysis was published, historian Douglas McNaughton based a mistaken theory about the ink around McCrone's emphasis on the chromium-rich black particle, having obtained unpublished data on the similar particles in Möller's report.Olin published a paper that identifies the anatase in the Vinland Map ink as being truncated bi-pyramidal rather than rounded crystals  (however, this is not vastly different from the McCrones' 1974 description of the crystals as "smooth, rounded rhomb shapes").Radiocarbon dating, begun in 1995 by physicist Douglass Donahue and chemists Jacqueline Olin and Garman Harbottle, places the origin of the parchment somewhere between 1423 and 1445.