The 1967 Sigiriya Frescoes Incident: A Scientific Conservation Intervention in Sri Lanka

 


Abstract

In October 1967, a deliberate act of vandalism severely damaged the Sigiriya frescoes, one of Sri Lanka’s most significant cultural heritage assets. Contrary to popular belief, the damage was caused not by tar but by the application of industrial enamel paint, which posed an unprecedented conservation challenge due to its deep penetration into the ancient lime-plaster substrate. This paper examines the nature of the damage, the scientific rationale behind the chosen conservation methodology, and the outcomes of the six-month restoration programme undertaken by Sri Lankan conservators with international assistance. The case represents one of the earliest large-scale applications of modern chemical conservation techniques to wall paintings in South Asia and remains a benchmark for heritage conservation ethics and practice in Sri Lanka.

1. Introduction

The frescoes at Sigiriya, dating to the 5th century CE, constitute a rare surviving example of early South Asian wall painting traditions. Executed on a complex lime-based plaster system and applied with mineral pigments, the paintings are exceptionally sensitive to chemical, mechanical, and environmental disturbance.

On 15 October 1967, the Department of Archaeology of Sri Lanka received reports of extensive damage to the fresco gallery. Subsequent inspection confirmed that a substantial portion of the paintings had been deliberately coated with green industrial enamel paint. At the time of discovery, nineteen figures were known to survive; fourteen of these had been directly affected.

2. Nature of the Damage

Scientific assessment revealed that the applied substance was a synthetic enamel paint typically used in automotive and industrial contexts. Unlike ink or bitumen-based materials, enamel paint forms a semi-polymeric film that adheres strongly to porous substrates and penetrates micro-fractures within historic plaster.

The consequences were threefold:

  1. Chemical Risk – Solvents capable of dissolving enamel paint also posed a threat to the original pigment layer.

  2. Mechanical Risk – Any abrasive removal would irreversibly damage the fragile surface.

  3. Ethical Risk – Over-intervention could result in loss of authenticity, violating emerging international conservation principles.

Additionally, localized mechanical damage to facial and torso areas of certain figures indicated intentional physical defacement, further complicating restoration.

3. International Assistance and Project Organization

Recognizing that the scale and complexity of the damage exceeded domestic conservation capacity alone, the Government of Sri Lanka sought international technical assistance. Through the facilitation of the Smithsonian Institution, Italian wall-painting conservator Luciano Maranzi was invited to collaborate with the Department of Archaeology’s Chemical Conservation Unit.

The restoration project was conducted under joint supervision, ensuring that decision-making authority remained with Sri Lankan institutions while benefiting from international expertise.

4. Methodology

4.1 Cleaning and Paint Removal

A staged and highly controlled methodology was adopted. Small test patches were first conducted to assess solvent behavior. Following successful trials, selective chemical agents—including Decapex-type paint removers and trichloroethylene (Trilene)—were applied using cotton swabs and soft carriers.

Paint removal was performed incrementally, often at the scale of millimeters per session, with continuous monitoring to prevent solvent migration into the original pigment layer.

4.2 Stabilization and Plaster Reintegration

Areas where the historic plaster had been compromised were consolidated using lime-based conservation mortars formulated to closely match the physical and chemical properties of the original substrate. These mortars were imported from Italy due to the absence of locally available materials meeting required specifications at the time.

All fills were intentionally kept distinguishable under close inspection, in line with conservation ethics that discourage falsification or speculative reconstruction.

4.3 Ethical Framework

The intervention adhered to principles that would later be codified in international charters, emphasizing:

  • Minimum intervention

  • Reversibility where possible

  • Respect for original material and historical authenticity

5. Results

The conservation programme extended over approximately six months, concluding in April 1968. Of the fourteen damaged figures, all were stabilized and rendered visually legible without compromising original material. While microscopic losses were unavoidable, no large-scale pigment loss occurred due to the intervention.

The frescoes were deemed safe for continued public display, with enhanced monitoring protocols introduced thereafter.

6. Conclusion

The 1967 Sigiriya frescoes incident represents a critical moment in the history of cultural heritage conservation in Sri Lanka. It illustrates both the vulnerability of irreplaceable heritage and the technical sophistication required to preserve it once damaged. More importantly, it demonstrates the effectiveness of collaborative conservation grounded in scientific rigor, institutional responsibility, and ethical restraint.

This case remains a foundational reference for conservation practice in Sri Lanka and underscores a broader lesson: while cultural heritage may be locally situated, its preservation relies on globally shared knowledge, professional ethics, and collective human responsibility.

References (Footnote-Ready)

  1. Department of Archaeology, Sri Lanka. Internal Conservation Reports on the Sigiriya Frescoes Restoration Project (1967–1968). Colombo.

  2. de Silva, R. Chemical Conservation of Wall Paintings in Sri Lanka. Department of Archaeology, Colombo, unpublished technical notes.

  3. Smithsonian Institution. Advisory Correspondence on the Conservation of the Sigiriya Frescoes. Washington, D.C., 1967.

  4. Maranzi, L. Technical Observations on the Removal of Enamel Paint from Historic Lime Plasters. Field Report, Sigiriya Project, 1968.

  5. UNESCO. Principles for the Preservation and Restoration of Wall Paintings. Paris, 1958.

  6. ICOMOS. International Charter for the Conservation and Restoration of Monuments and Sites (Venice Charter). Venice, 1964.


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