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Najafian M, Eghbali P, Hamzavi Y. (2025). A Comparative Study of the Execution Method of the Koshtehbori Stucco Decoration with other Stucco Decorations in Safavid Period Architecture. Parseh J. Archaeol. Stud.. 8(30), 309-336. doi:10.61882/PJAS.8.30.309
URL: http://journal.richt.ir/mbp/article-1-953-en.html

 Abstract
During the Safavid period, innovations were created in Stucco decorations. the Koshtehbori Stucco decoration is one of the most attractive and unique architectural decorations of the Safavid period, which was implemented with various motifs in some of the buildings of that period and has a special creativity and innovation that is different from the implementation of other types of Stucco decorations. Knowing the methods and implementation steps of Stucco decorations in restoration projects and studying them is considered as one of the essential elements and an inseparable part of the protection of historical Stucco decorations. The purpose of this research is to identify the similarities and differences, the variety of methods and the stages of implementation of Koshtehbori Stucco decoration with other Stucco decorations in the architecture of the Safavid period. The questions of this research are: What are the similarities and differences of Koshtehbori Stucco decoration with other Stucco decorations in Safavid period architecture in terms of the method and stages of construction and execution? What is the appropriate classification for technical types of Stucco decorations in Safavid architecture? The research method is descriptive-analytical and comparative, and the collection of findings is in the form of library studies and field observations. The results of the studies showed that, unlike other Stucco decorations of the Safavid period, in the execution of the Koshtehbori Stucco decoration, Finishing, polishing, Convex or concavity was not done on the surface of the motifs, and only the background of the design or some carving motifs. In terms of the method, stages and sequence of execution, the Koshtehbori Stucco decoration, is the most similar to the Stucco decoration with carved colored layers. These similarities are in terms of the thickness of each layer of one millimeter and the method of cutting at an angle of 90 degrees to the surface of the motifs and polishing and smoothing the carved parts. Is. Also, in terms of the method, steps and sequence of execution, the Koshtehbori Stucco decoration, is the most different from the carved decoration filled with colored gypsum.
Keywords: Koshtehbori, The Technique of Implementing Stucco Decorations, Classification of Stucco Decorations, Safavid Period Architecture.

Introduction
Stucco decorations in Iran’s architecture have been implemented with different techniques and methods, one of which is the Koshtehbori Stucco decoration. The method and technique of execution of the Koshtehbori Stucco decoration in the Safavid period architecture is different from the Stucco decorations before it and required less time and economic cost per unit area than the relief Stucco decorations of the previous periods. This ornament has a special beauty, it has a variety of colors or different motifs. Previous research by experts in Iranian architecture and art history has focused mostly on Stucco decoration motifs and less on stucco types, comparative analysis of construction methods and techniques. A special classification and understanding of the execution method of Safavid period Stucco decorations can draw more attention to documentation and practical aspects in their basic maintenance and restoration. This research aims to identify the similarities and differences, variety of methods and stages, and execution order of the Koshtehbori Stucco decoration in comparison with other Stucco decorations of the Safavid period, as well as classify the Stucco decorations of this period.
The research questions are: What is the appropriate classification for technical implementation types of Stucco decorations of Safavid period architecture? What are the similarities and differences between the Koshtehbori Stucco decoration and other Stucco decorations of the Safavid period in terms of construction methods and stages? Research method: This research used a descriptive-analytical method to investigate some architectural Stucco decorations in Iran through library studies and field observations. The statistical population of this research includes 6 types of common Stucco decorations in Safavid architecture. The common features and differences between the Koshtehbori decoration and other Stucco decorations of the Safavid period were presented in a descriptive-analytical and adaptive-comparative method in terms of execution methods and stages. For this purpose, common Stucco decorations were examined in terms of the order of executive layers, such as support, scratch coat(arriccio) and fine coat (intonaco) layers, type of background, design drawing and stabilization, plastered layer, and finishing steps. The findings of this research were collected through written and documented sources, as well as field investigations by the authors, including pictures of examples of common Stucco decorations of the Safavid period architecture. In addition to proposing a new classification and naming of some decorations, the research analyzed different types of Stucco decorations by comparing samples to identify similarities and differences between Safavid period Stucco decorations.
 
Discussion
- Presenting a suitable classification of Stucco decoration of Safavid period architecture
This research proposes a new classification system for Stucco decorations in Safavid period architecture based on seven specific criteria. These criteria include the method of shaping, the kind of materials used in the background, the appearance of the surfaces on the motifs, the size and amount of relief, finishing works, in terms of the background and shape of the motifs. Each criterion has a different category, which allows for a more precise identification and recognition of different Stucco decorations. This classification system is crucial for the conservation and restoration of these decorations, as it helps to avoid unprincipled interferences in restoration interventions.
 
- A comparative study of the Stucco decoration of Koshtehbori with other Stucco decorations in Safavid period architecture
In this regard, six different Stucco decorations that were commonly used and innovative during the Safavid period were selected and compared with the Stucco decoration of Koshtehbori in terms of execution method and order. These are:
A: Stucco decoration of Koshtehbori: This decoration, with different techniques and motifs, has been implemented in some buildings of the Safavid period. These decoration are often prepared, designed and implemented with various geometrical, Khataei and Slimy motifs on a background of plaster mortar, which is different from other plaster ornament methods.
B: Stucco decoration with carved colored layers: Among other Stucco decorations in the architecture of the Safavid period, this decoration is the most similar to the Stucco decoration of Koshtehbori.
C: Stucco decoration on Simgel: This decoration is different from the Stucco decoration of Koshtehbori in terms of grouting with mud in the background (empty space between the motifs), the curvature around the motifs, the relief of the motifs, and the shape of the motifs.
D: Stucco decoration on a flat mirror: In this Stucco decoration, flat mirrors are used as a Stucco substrate. In terms of the mirror background between the patterns, the curvature around the patterns, the relief of the patterns, and the shape of the patterns, this Stucco is different from the Stucco decoration of Koshtehbori.
E: Stucco decoration on the Koj mirror (Kopbori): This Stucco decoration is made using the combination of Koj mirror and Stucco parts. This decoration, in an additional stage of initial drawing and transfer of the design, adhesive plaster mortar behind the mirror, in terms of the mirror background of Koj between the motifs, the curvature around the motifs, the relief of the motifs and in the shape of the motifs with the Stucco decoration of Koshtehbori is different.
F: The Naghri Stucco decoration filled with colored gypsum mortar: the Koshtehbori Stucco decoration is the most different from the carved Stucco decoration filled with colored gypsum mortar compared to other Stucco decorations in Safavid period architecture
In the end, the six Stucco decorations of the Safavid period are compared with their sub-groups in the seven classifications in the architecture of the Safavid period. Based on this comparison, we can observe their similarities and differences in the subgroups. For example, the shaping technique of the six types is done in situ, and the type of material used in the background of the Koshtehbori Stucco decoration, the Stucco decoration with carved colored layers, and the Naghri decoration filled with colored plaster is gypsum. However, in the other three decorations with different materials, it is Simgel, flat mirror, and koj mirror.

Conclusion
Through the study and research conducted, a more comprehensive classification and suitable division for Stucco decorations in Iranian architecture has been presented. In this research, Safavid period gypsum decorations are classified based on a specific seven criterion, which includes shaping technique, material used in the background, surface appearance of patterns, size and amount of relief, and complementary works, in terms of both background and pattern shape. Each of these criteria has its own subgroups. 
Stucco decorations in Safavid architecture have similarities and differences in terms of their technical aspects and design. In the execution of the Koshtehbori Stucco decoration, unlike other Safavid Stucco decorations, carving, polishing, convex or concaving on the surface of patterns was not performed, and only the background or some parts of the pattern were carved and polished. In terms of the method, stages and sequence of execution, the Koshtehbori Stucco decoration, is the most similar to the Stucco decoration with carved colored layers. These similarities are in terms of the thickness of each layer of one millimeter and the method of cutting at an angle of 90 degrees to the surface of the motifs and polishing and smoothing the carved parts. Is. Also, in terms of the method, steps and sequence of execution, the Koshtehbori Stucco decoration, is the most different from the carved decoration filled with colored gypsum. Stucco decorations on Simgel, on flat mirrors, on Koj mirrors, in terms of the surface of the motifs, which may be Koj or a combination of Koj and Kav, and also, the type and appearance of the motifs, are different from the Koshtehbori Stucco decoration.