Volume 34, Issue 6 (November 1989)

    The Use of k Values in the Interpretation of Glass Density and Refractive Index Data

    (Received 8 October 1998; accepted 21 December 1988)

    CODEN: JFSOAD

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    Abstract

    A k value represents a type of summary statistic by means of which glass evidence may be interpreted. This statistic is defined as k = V/D, where the dispersion V = (nD − 1)/(nFnC), and where D is the density. The k value is therefore the slope of a line through the 0,0 origin and a plot of dispersion versus density. Obtaining a k value facilitates the interpretation of commonality of source, since “within-item” variation in density and refractive index does not significantly alter the k value. “Between-item” variation, on the other hand, profoundly influences the k value, even if the density and one of the refractive indices are coincidentally similar.


    Author Information:

    Thornton, JI
    Professor of forensic science, University of California, Berkeley, CA


    Stock #: JFS12773J

    ISSN: 0022-1198

    DOI: 10.1520/JFS12773J

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    Author
    Title The Use of k Values in the Interpretation of Glass Density and Refractive Index Data
    Symposium , 0000-00-00
    Committee E30