6 HEALTH AND SAFETY DATA

Chromotropic acid: Irritant to eyes and respiratory system. Use in a fume hood, and wear gloves and goggles.

Sulfuric acid (concentrated): Corrosive. Wear gloves and goggles when handling.

ACKNOWLEDGEMENTS

The authors would like to thank Vincent Daniels and Susan Bradley of the Conservation Research Section, British Museum, and Dekang Zhao of the Conservation Laboratory, Museum of Chinese Revolution, for advice on the investigation and comments on the manuscript. They would also like to thank Andrew Oddy, keeper of the Department of Conservation, British Museum, and Jigao Hu, Chinese Conservation Institute, for encouragement to publish.