Knowledge of Conservation and Restoration

Corrosion, Patina and Original Surface: A Look at the Controversial Concept of Patina in Ancient Bronzes-Its Values and Conservation Principles

Mohammad Mortazavi

One of the most widely used terms in the conservation and restoration of cultural and historical artifacts, particularly in the field of ancient metal objects, is patina. Although, this term is also applied to other historical materials, such as paintings and stones, its frequent used in the context of ancient bronzes makes it essential to develop a clear and accurate understanding of its meaning and implications. From the perspective of the studying deterioration of the artifacts, patina-as corrosion products in bronze artifacts-can significantly impact both the tangible and intangible aspects of the objects. on the one hand, it contributes certain values, such as age and aesthetics. On the other hand, it serves as an important criterion in conservation and restoration practices. However, the lack of comprehensive and precise definition of this term leads to complexity in conservation decision-making. In this paper, based on a literature review, the differing and similarity viewpoints on patina have been investigated. Following this, the term is reviewed in relation to different corrosion morphologies, and issue related to its current definitions are discussed. The different values of the patina are debated, and its role in the principles of conservation is reevaluated. In this field, confusion arising from the application of the term patina in the conservation of archaeological bronzes have been highlighted. Finally, considering the unique properties of corrosion phenomena in archaeological bronzes, the concept of the “original surface” is discussed as an approach to addressing this issue.

Study and Analysis of the Wall Paintings Technology in the Chelleh-Khaneh of Pir-e Bakran Shrine

The study and examination of Iranian wall paintings, given their historical significance and visual-artistic value, have consistently attracted the attention of researchers and art historians. When the topic of Iranian painting is raised, images found in manuscripts and albums often come to mind. However, it should not be overlooked that Iranian artists have long been active in various fields of visual and decorative arts. Evidence suggests that the art of wall painting predates the tradition of book illustration by a considerable margin. In ancient times, wall painting held the greatest prominence among various forms of visual arts. Nevertheless, during the four centuries of Mongol rule over Iran, its significance diminished substantially in comparison to book illustration. It was not until the Safavid period that this visual art form regained attention, with examples of it observable in the royal palaces preserved from that era. As noted, during the Mongol period, the importance of wall paintings significantly declined compared to book illustration, and despite the presence of valuable miniature paintings, few wall paintings from this period have survived. The paintings in the Chelleh-Khaneh of the Pir-e Bakran Shrine are among the rare surviving pictorial examples from this era, featuring designs and motifs closely resembling the miniatures of the schools of that period. They also exhibit notable differences from Safavid wall paintings in terms of composition, the colors used, and the design of motifs. Therefore, in addition to studying the visual elements and comparing them with the surviving miniatures from this period, it is essential to investigate the technical aspects, execution methods, and materials used in this valuable historical and artistic work. This article endeavors, within the limits of available resources, to enhance understanding of the work through comparative-historical and technological studies. To this end, laboratory methods were employed to analyze the types of colors used in the work and the techniques of their application. However, due to limitations in sampling from this highly exquisite and unique piece, the study of the materials and substances used in the execution of its decorations remains incomplete, with shortcomings that are hoped to be addressed in future stages of research and investigation .

Technique Analysis of the Historical Pulpit of Gorgan Jame Mosque

The conservation and restoration of historical and cultural artifacts in Iran are increasingly recognized as important fields of study. Among these, the conservation and restoration of wooden artifacts remain underexplored. The treatment of artifacts damaged by mechanical, chemical, and biological factors must be informed by prior studies to minimize the effects of these destructive influences. The Jameh (gathering) Mosque of Gorgan, a significant historical building from the Islamic era, contains many valuable decorations and artifacts, including its distinguished wooden pulpit (minbar). This pulpit, based on surviving documents, is believed to date back to the Timurid period and features intricate lattice work (gereh-chini) and wood carving (monabbat-kari), which greatly enhance its historical significance. The main objectives of this research are to understand the construction techniques used for the mosque's pulpit and to analyze the physical and chemical composition of the materials employed. To achieve these objectives, methodologies including documentation, microscopic examinations, and Fourier-transform infrared spectroscopy (FTIR) analysis were utilized.

A Research on the Fundamentals of Historical Structure Restoration with a Focus on the Reproduction of These Works

Musical instruments, as an integral part of cultural and historical heritage, possess not only artistic and aesthetic values but also significant scientific, technical, and musical aspects. Due to the per formative nature of music, musical instruments are susceptible to wear and deterioration, presenting unique challenges for their preservation and restoration. Unlike many historical artifacts that are restored solely to preserve their physical structure and prevent decay, the restoration of musical instruments must consider the aesthetic sonic concepts of the work in addition to preserving its cultural and historical identity. Any intervention in these instruments should be carried out in a way that does not negatively affect their sonic and structural authenticity. In some cases, due to the high sensitivity of historical instruments and the potential for physical damage during studies and investigations, researchers have resorted to reproducing similar examples. This requires precise knowledge of the organ logy of the instruments and their construction techniques in different historical periods. In this research, the historical introduction and classification of instruments are presented first, and then the structural characteristics of each group are examined. Subsequently, study strategies appropriate to the characteristics of each historical group are provided, and the theoretical foundations for the preservation and restoration of musical instruments are developed. The results of this research show that the restoration process of historical instruments, due to their structural and acoustic diversity, requires different approaches and a deep awareness of the physical and sonic characteristics of each instrument. Therefore, restorers must have a comprehensive understanding of the acoustic dimensions and materials of the instruments before any intervention to strike a balance between physical preservation, sonic reproduction, and the preservation of cultural authenticity.

A Review on the Application of Electrochemical Methods in Conservation and Restoration

Conservation science is an interdisciplinary field that largely owes its foundation to other sciences. Among these sciences, electrochemical methods can be mentioned. Electrochemical methods play an important role in various aspects of the conservation and restoration of historical objects. Briefly, the application scope of electrochemical methods in conservation and restoration can be divided into: identification and investigation of constituent materials in historical artifacts, restoration and cleaning methods, and environmental condition assessments in museum display areas and storage facilities of historical objects. Identification and Investigation of Constituent Materials: Identifying the components of artistic and archaeological artifacts is an important matter in scientific investigations. Some of these objects are composite. Additionally, some objects are heterogeneous while others are homogeneous, and some are accompanied by considerable amounts of other materials, such as binding media, paints, pigments, etc. At first glance, it may seem that electrochemical methods could perform this task without causing damage to the artifact. However, further investigations in this area are required. Restoration and Cleaning Methods: Electrochemistry has been used for over a century in the treatment of historical metal objects. These methods can be employed in artifact treatment; perhaps their ideal capability would be reversing the corrosion process in ionic compounds. However, in applying these methods, depending on the condition of the artifact, treatment priorities may lean toward strengthening, stabilization, or cleaning of the historical artifact. Environmental Condition Assessments: Scientists and researchers are continuously investigating and evaluating harmful conditions in museum environments. This is because pollutants, even in very small quantities, can be one of the most important factors in the deterioration of historical artifacts, and their detection and identification are often inaccessible due to high sensitivity and cost. Moreover, conventional methods lead to the identification of pollutants at low concentrations (one part per billion), but it is difficult to determine their damage potential. This is because the synergistic effects (Synergy) and additive effects of these compounds when mixed together, as well as their surface effects on historical objects, cannot be accurately calculated. Can electrochemical methods be used as a measurement tool for investigating museum conditions? This paper generally addresses the role, importance, strengths, and weaknesses of electrochemical methods in the aforementioned areas within the field of conservation and restoration of historical objects. The aim of this paper is to present a new approach to the application of electrochemical methods and their advantages and disadvantages in the restoration and conservation of historical artifacts.

Methods of parchment conservation and restoration

Narguess Afzalipour

Parchment, typically derived from the skin of goats, sheep, or deer, is a common material for handwritten treasures and various artistic artifacts. It is composed of collagen, some keratin, elastin, and very small amounts of albumin and globulin. Generally, leather is not a single material but rather a group of related materials with many common characteristics. Products made from skin, such as rawhide (untanned), parchment, fur, leather, and others, share many of these properties. Given the sensitivity of these objects, it is essential to conduct tolerance and solubility tests on the parchment, adhesives used in the binding and old repairs, ink, and pigments with respect to solvents used for cleaning, stain removal, and removal of old repairs and additions before commencing parchment conservation and restoration. This is because all materials used may have a specific impact on its structure. In the present study, the structural studies of skin and the manufacturing method of parchment are investigated. Damages and damaging agents have been studied, and softeners, adhesives, and consolidants used have been reviewed based on available resources. An attempt has been made to compile methods of parchment restoration and reconstruction based on the latest available techniques in this field. It is hoped that the initiation of research such as this article will pave the way for broader and more comprehensive research in this direction.

Iranian Stone Architecture: The Necessity of Re-examining Its Evolution and Stylistic Development

Building materials, particularly stone, play a fundamental role in shaping architectural styles and identity. Despite the long history of stone usage in Iranian architecture, this material has seldom been studied independently and analytically in stylistic research. Stone architecture—from early natural spaces such as caves to hand-carved dwellings across Iran, and from prominent governmental and religious structures throughout various historical periods up to the contemporary era—provides a valuable context for understanding the relationship between materials, construction technology, and stylistic evolution. This brief article aims to introduce a systematic classification framework for Iranian stone architecture, emphasizing the necessity of re-examining this field from a stylistic perspective. In addition to exploring the reasons behind the relative neglect of this subject, the study examines how different forms of stone contribute to the remarkable diversity of building materials. Furthermore, it investigates the various applications of stone in architecture to analyze the stylistic features of Iranian stone architecture, independent of ruling dynasties and historical periods