Stabilization of Glass Corrosion
From Conservation of photographic negatives
| Conservation Treatments |
- Glass corrosion products can be removed by chelating agents like poly-phosphates (e.g. Calgon), amino carboxylic acids (e.g. EDTA) or hydrogen carboxylic acids, but it’s very difficult to control these treatments since also the ions from the stable part of the glass will be complexed, using the chelating agents as gel or paste can be a solution (weakening of the top corrosion layer, then scraping it off), in every case these are severe treatments
(NEWTON, ROY, 1989, 165-197)
- Washing of the corroded glass is possible as follows:
(WERNER, ANTHONY E.A., 1966)
- Bath of nitric acid (1% in water)
- Bath of distilled water
- 2 sequent bathes of alcohol or denatured alcohol
- Drying (without heat since microcracks in the glass can deepen and lead to severe damage)
- Another source recommends never to use aqueous solutions with corroded glass
(NORRIS, DEBBIE HESS, 1998)
[edit] References
- NEWTON, ROY, 1989. Conservation of Glass. Oxford: Butterworth- Heinemann
- NORRIS, DEBBIE HESS, 1998. Surface Cleaning of Damaged Photographic Materials; Current Practice and Concerns. In S. Clark ed. Care of Photographic Moving Image & Sound Collections, 20th-24th July 1998, York, England. Institute of Paper Conservation. 96-101
- WERNER, ANTHONY E.A., 1966. The Care of Glass in Museums. Museum News Technical Supplement, 13, 45-49
