The trial pieces, which were used to test that the impression made by a die was clear and accurate, were in very good condition.
Most of the detail of the coin impressions had survived in a smooth, protective corrosion layer under thin patches of soil. This was removed carefully with soft brushes made of very fine glass bristles, and the detail of the coin stamps came to life.
The coin dies themselves were made of iron, and needed little treatment at the time of excavation.
Recent air abrasive treatment has revealed sharper detail on the striking face of the large complete die. A rectangular depression was noted on the image of the sword, which marked the centre of the die, and other details such as the colour difference between the hardened cap and the rest of the die were enhanced.
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