Touchstone and gold stars.

Touchstone and gold stars.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

Touchstones were used for many years to judge the purity of gold. A goldsmith would compare the streaks made by a potential piece of gold on the touchstone to those made by real gold. The points of the stars were all marked by gold of different purities, which allowed for greater refinement. The touchstone was usually a fine-grained dark schist or jasper.

© Science Museum / Science & Society Picture Library

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