JAIC 2002, Volume 41, Number 2, Article 2 (pp. 111 to 126)
JAIC online
Journal of the American Institute for Conservation
JAIC 2002, Volume 41, Number 2, Article 2 (pp. 111 to 126)

SILVER-MIRRORING EDGE PATTERNS: DIFFUSION-REACTION MODELS FOR THE FORMATION OF SILVER MIRRORING ON SILVER GELATIN GLASS PLATES

GIOVANNA DI PIETRO, & FRANK LIGTERINK


ABSTRACT—The silver mirroring that can be seen on many historical silver gelatin photographic glass plates is typically observed to be distributed in certain specific and distinct patterns. A study of these patterns gives information on the causes of silver mirroring and on the detailed nature of the degradation mechanism. This article presents two mathematical models based on the diffusion and reaction of gases that explain the formation of silver-mirroring edge patterns in the case of plates kept in stacks and in the case of plates freely exposed to environmental gases. The predictions are compared with the patterns found on historical plates and with the patterns artificially produced on new plates.
[Spanish Abstract] [French Abstract]

Article Sections:

1. INTRODUCTION
2. PRESENT KNOWLEDGE OF SILVER MIRRORING
3. THEORY
4. EXPERIMENTAL PART
5. RESULTS
6. DISCUSSION
7. CONCLUSIONS
a: Appendix , Materials , References , Author Information
Entire Article

Copyright 2002 American Institution for Conservation of Historic & Artistic Works