(Received 14 February 1978; accepted 14 June 1978)
Published Online: January
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The matching of fractured glass fragments has been extended by von Bremen  to include the intrinsic heterogeneities referred to in the glass industry as “ream” . Von Bremen used a fiber optics source to project a shadowgraph of fractured glass onto a photographic film that was then developed. Although this is a powerful method for comparing ream marking, the technique suffers a disadvantage in that the ream cannot readily be seen with the naked eye in all samples. It is readily apparent in container glass, lamp bulb glass, and drawn window glass. In other types of glass including float glass, the photographic film must be developed before it is known whether an image of the heterogeneities of the glass has been adequately recorded.
Associate professor of forensic science, School of Public Health, University of California, Berkeley,
Assistant professor of forensic science, California State University, Sacramento, Calif.
Stock #: JFS10796J