This image is released under a CC BY-NC-SA 4.0
Licence
License this image for commercial use at Science and Society Picture Library
LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
License this image for commercial use at Science and Society Picture Library
LicenseRectangular touchstone purchased in the bazaar in Izmir in
Science Museum Group
© The Board of Trustees of the Science Museum
Rectangular touchstone purchased in the bazaar in Izmir in
Science Museum Group
© The Board of Trustees of the Science Museum
Rectangular touchstone purchased in the bazaar in Izmir in Western Turkey in July /August 1986 by Prof Andrew Ramage. Previous identifier: 1986-7
Touchstones are fine-grained siliceous stones, on whose abrasive surface a gold sample undergoing checks for purity would be rubbed. A streak of gold would be left on the stone’s surface, which could be compared against gold of known quality, to establish the sample’s purity. Touchstones were the main means of assaying the quality of gold throughout history, but remain in use today.
Details
- Category:
- Metallurgy
- Object Number:
- 2019-86
- Materials:
- stone
- Measurements:
-
Height = 20mm
Width = 100mm max
Depth = 100mm max
Weight = 0.2kg (est.)
- type:
- touchstone
- rights:
- Science Museum Group
- credit:
- Gift of Dr W.A. Oddy