Frit-Core Beads in North America
Among the earliest European beads to reach North America is a distinctive group generally referred to in the archaeological literature as frit-core or frit-cored, so called because their interiors consist of sintered sand rather than solid glass. Likely produced in France, they are restricted to northeastern North America and have short temporal ranges, making them ideal chronological indicators for the latter part of the 16th century and the very early 17th century.
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"Frit-Core Beads in North America."
BEADS: Journal of the Society of Bead Researchers
28: 60-65. Available at: