Hoxne Hoard - Scientific Analysis of Finds

Scientific Analysis of Finds

The initial metallurgical analysis of the hoard was carried out in late 1992 and early 1993 by Cowell and Hook for the procedural purposes of the coroner's inquest. This analysis used X-ray fluorescence, a technique that was applied again later to cleaned surfaces on specimens.

All 29 items of gold jewellery were analysed, with silver and copper found to be present. Results were typical for Roman silver in hoards of the period, in terms of the presence of copper alloyed with the silver to harden it, and trace elements. One repaired bowl showed a mercury-based solder.

The large armlet of pierced gold (opus interrasile) showed traces of hematite on the reverse side, which probably would have been used as a type of jeweller's rouge. This is the earliest known and documented use of this technique on Roman jewellery. Gilt items showed the presence of mercury, indicating the mercury gilding technique. The black inlay on the cast silver tigress shows the niello technique, but with silver sulphide rather than lead sulphide. The settings of stones where garnet and amethyst remain, in the body chain, have vacant places presumed to be where pearls were set, and show elemental sulphur as adhesive or filler.

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