Abstract
Among the architectural arrays of Imamzadeh Hossein in Qazvin that can provide valuable information to researchers, are the remaining parts of the murals. Considering that Qazvin was the capital during the second period of Safavid rule, the study of Safavid and Qajar period buildings in this city can be of great importance. Compared to the existing historical monuments, few studies have been done on the technical knowledge of the layers of historical murals.In the present study, the identification and recognition of pigments related to the remaining murals of this monument and gilded layers has been considered. Also, in order to complete the technical information of the murals, the mortar of the fine coat (finishing plaster) and scratch coat (levelling coat) under the paint has been studied in terms of structure and chemical composition. To identify the pigments used in the murals as well as the materials used in the mortar of the underlying layers of the mural and the floor mortar, the hydraulic properties and the mineral and chemical composition of the mortar from X-ray diffraction, scanning electron microscopy coupled with energy dispersive spectroscopy and digital microscope have been used. As a result of the studies, it was found that the Pastiglia in the murals is made of a mixture of gypsum and Bole (Armenian Bole, Hormoz Bole). Apply a white Primary layer on the pastiglia on which the gold leaf is applied with low copper impurity. In this murals, three types of gold sheets have been executed. Green: A mixture of arsenic pigment with azure blue and Prussian blue; Green-blue: a mixture of green earth pigment (Celadonite) with white lithopone; Blue: a mixture of azure and Prussian blue pigments with White lead; Red: A mixture of ocher red and orange arsenic; Primary layer filler: a mixture of Huntite and White lead; black: It is a mixture of cobalt black and iron black. The structure and composition of mortars were also identified.
Keywords: Mural, Pigment, Gilding, Structural Study, Mortar, Qazvin.

Introduction
The technical diversity of murals in the Safavid and Qajar periods is one of the important issues of knowing historical murals. To technical understanding historical mural, its different layers are subjected to careful scientific study. The main layer is the color layer which consists of two parts: dye and binder. It should be noted that the array of gilding in the mural and the borders of the mural is also considered as a mural. Imamzadeh Hossein is one of the prominent buildings of Qazvin city. Most of the murals of this building belong to the Qajar period. Evidence shows that traces of the Safavid periodare also left in this building in the lower layers.
The aim of the current research is to obtain technical information about the layers of murals of this historical building. Identifying and recognizing the pigments in historical murals from archeology point of view helps completing the technical information about the use of pigments by artists. Some pigments have a specific starting date, which helps clarify the date of making the murals.
In archeology, studies have been conducted regarding the technical knowledge of different layers of historical murals in Iran, but very few studies have been done considering the volume of murals in Iran in different periods. Therefore, it is necessary to more complete these studies over time which its result is to complete the database in this field. In the upcoming research, in order to know more about the murals, technological studies were done on it. After field studies, the pigments used in the murals were sampled and identified. To complete the information, the lining layers and the substrate and a sample of the floor mortar were also studied. In this regard, the main questions of the current research are: What pigments are used in the murals of Imamzadeh Hossein in Qazvin? What method was used for gilding in these murals? What are the physical and structural characteristics of the lining layers and substrate of the studied murals?

Discussion in the Results and Findings
a. Scanning Electron Microscope: In the sample (2021.Q.IH.1) there is a large accumulation of gypsum crystals and intertwining has been created between them. The empty space between the crystals is little and also the crystals are irregularly placed together at different angles. In 2021.Q.IH.10 sample, needle- shaped gypsum crystals that are intertwined can be seen in many parts. In 2021.Q.IH.11 sample, gypsum crystals in different sizes are placed at different angles. In this sample, there is no long needle crystal and instead, the crystals have grown a lot in the width direction. In 2021.Q.IH.12 sample, the gypsum crystals are slightly different in terms of shape from the samples of the floor and lining layer.
b. Energy-dispersive X-ray spectroscopy (EDX): In 2021.Q.IH.1 sample, there is a small amount of silicon, aluminum and magnesium, which is related to soil. In 2021.Q.IH.2 sample, the amount of sulfur is about 13% which some part of it is related to yellow pigment and some part is related to blue pigment. In 2021.Q.IH.3 sample, elements of potassium, aluminum, iron, magnesium and silicon can be seen next to oxygen. These elements are related to Verona green or green earth pigment. In 2021.Q.IH.5 sample, a high percentage of gold and a relatively low percentage of copper were detected in the sample. In 2021.Q.IH.6 sample, two coloring elements, iron and arsenic, along with sulfur have been detected. In 2021.Q.IH.7 sample, the main filling material is huntite or chalk. On the other hand, a small amount of lead has been detected in this sample. Gold, copper and iron have been detected in 2021.Q.IH.8 sample. In 2021.Q.IH.9 sample, two elements, cobalt and iron, along with sulfur, are significant and influential elements in making black color. In 2021.Q.IH.10 sample, the highest percentage of elements is related to calcium and sulfur. In 2021.Q.IH.11 sample, except the main elements of gypsum, a very small amount of elements of silicon, aluminum and magnesium have also been detected.
c. X-ray diffraction spectroscopy: As a result of the phase analysis of 2021.Q.IH.1 sample which is related to the lay-up under the gold sheet, quartz has been detected. The quartz detected in the lay-up is related to the red flower (Armenian flower) that was added to the plaster during the mortar processing. The next identified phase is gypsum. As a result of the phase analysis of 2021.Q.IH.10 sample which is related to the floor coating mortar, quartz has been detected. The next identified phase is gypsum. As a result of the phase analysis of 2021.Q.IH.11 sample, which is related to the floor coating mortar, anhydrite phase has been detected in the studied sample. The amount of anhydrite in the lining layer is higher than gypsum. As a result of phase analysis of 2021.Q.IH.12 sample, which is related to the substrate layer in the studied mural, quartz has been detected. The granularity of the quartz phase in the substrate was much finer than the previous samples. The next identified phase is gypsum.

Conclusion
The lay-up used in the murals of this building is made of a mixture of plaster and red flower (Armenian flower, Hormoz flower). Green color is a mixture of arsenic pigment with lapis lazuli and Prussian blue. Blue-green color is a mixture of green earth pigment with lithopone white. The blue color is a mixture of lapis lazuli and Prussian blue pigment along with white lead. The golden color of embossing is gold sheet with a small amount of copper impurity. The layer that is applied on the lay-up is also a gold sheet with a small impurity of copper. In line with the studies on the shiny brown sample, it was concluded that this layer is a gold sheet with copper and iron impurities, which its surface has corroded and darkened over time. In fact, three types of gold sheets have been used in the studied murals that two of them are similar and seem to belong to the same period. A layer that is different in terms of the composition of elements and impurities belongs to later periods. The red color in these murals is a mixture of red ocher and orange arsenic. The white color filling the preparatory layer is a mixture of huntite and white lead. Black color of embossing is a mixture of cobalt black and iron black. Contrary to imagination, the floor mortar is a gypsum mortar with two phases of gypsum and anhydrite to which some sand and soil have been added. Due to proper processing, this mortar has adequate strength, although humidity has caused damage to the work over time. The lining layer and the substrate in the studied murals are made of plaster mortar. There is a difference that the thickness of the lining layer is greater than that of the substrate and it has coarser graining and more impurity. On the other hand, the looser mortar of the substrate is due to the way of processing, and the arrangement of gypsum crystals is different from that of the lining layer.

Abstract
In this study, the colors used in the Inscription and mural paintings of tomb of Ghadmagah in Neishabour were analyzed by instrumental analytical methods. Ghadmagah is located in the center of the Zabarkhan section, on the Neyshabur-Mashhad Road. Ghadmagah tomb-garden is located in the village of the same name 24 kilometers east of Neyshabur, Iran, and was built in the early seventeenth century. According to historical sources Ghadmagah was built in the early eleventh century AH (ca. 1600 AD), and the origin of this site dates back to Islam. Some believe that the Ghadmagah monument was designed by Sheikh Baha’i. The architectural decoration of this building is most importantly tiling, plastering and mural paintings. Given that the building was built in different periods and originally dates back to the Safavid period. The present study aimed to study the color bedding and pigments in the Inscription and mural paintings of the building to find out what period the mural paintings in the building belong to. Mural painting is one of the Iran arts that based on the signs of old paint can be pursued to pre-history. One of the most important issues in the study of historical paintings, especially mural paint, is the identification of the nature of paintings used to decorate the walls. Identification of pigments is also important not only from the perspective of archeology but also in terms of the history of art and knowledge of degradation processes and the development of monument conservation strategies is also important. In this study, instrumental methods such as scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), Fourier- transform infrared spectroscopy (FTIR), polarized light microscopy (PLM), X-ray diffraction (XRD) and micro-Raman spectroscopy have been used for elemental and compound microanalysis of the samples. 
Keywords: Pigment, Neyshabur Ghadmagah, Inscription, Mural Painting, Analytical Methods.

Introduction
The use of physical and chemical analysis methods to identify the constituents of works of art, before any intervention occurs, plays a key role; because the results of such an analysis are very useful for deciding whether to conserve or regenerate these materials. In addition, each of the different pigments can have a different regeneration process. On the other hand, the analysis of ancient paintings may provide information about the artistic techniques and visual materials used in the past and expand the knowledge of the customs and techniques of ancient societies. 
In fact, physical and chemical analysis provides useful information about the range of pigments present in an area and knowledge of dye preparation techniques and applications. In addition, the study of the originality and origin of pigments allows the discovery of connections and trade lines. On the other hand, restorers need detailed information about the chemical composition of the materials used in a work before restoration work. 
Identifying the materials and pigments used in this building is one of the most important questions of this research, and then by considering the history of using pigments, we can understand the dating of the paintings in this building. Do these paintings belong to the period of construction of the building, ie the Safavid period, or were they added to the building in later historical periods? Depending on the type of painting pigments, the colors can be restored. 

Materials and Methods 
In this research, empirical and analytical methods have been used to achieve the goals. Data collection is based on information from library studies and instrumental methods. The complete information of the devices used in this research is fully described in the Materials and Methods section. 
In this study, instrumental methods such as scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX), Fourier- transform infrared spectroscopy (FTIR), polarized light microscopy (PLM), X-ray diffraction (XRD) and micro-Raman spectroscopy have been used for elemental and compound microanalysis of the samples. 

Data 
The result of the analysis showed that the blue color was used in inscription was artificial ultramarine (Na6-10Al6Si6O24S2-4) on a gypsum layer (CaSO4.2H2O) also gold color showed presence of copper and zinc alloy in the ratio of 10:1 in gold color. The blue color used in the mural paintings was also artificial ultramarine on a red layer of ochre. The result of micro-Raman showed that green pigment was copper phthalocyanine (phthalocyanine green). The results of identification of the orange-red revealed the presence of a mixture of red lead (minium) and red ochre (iron oxide) in the sample. Also, according to the obtained results, ochre and mixture of iron and manganese oxides were used in red and brown colors. 

Discussion 
The inscription at the top of the building used two colors, blue and gold, the result of the analysis showed that the blue color was artificial ultramarine (Na6-10Al6Si6O24S2-4) on a gypsum layer (CaSO4.2H2O). The absence of minerals such as pyrite and calcite in the PLM images indicates that the ultramarine is synthetic. The blue color used in the mural paintings was also artificial ultramarine on a red layer of ochre. The result of micro-Raman showed that green pigment was copper phthalocyanine (phthalocyanine green). A synthetic organic material composed of chlorinated copper phthalocyanine (chlorinated Phthalocyanine blue). Phthalocyanine green was introduced as an industrial pigment in 1938. This pigment is unaffected by light, heat, and chemicals the use of this pigment showed that the mural paintings was restored in Contemporary period. The results of identification of the orange-red revealed the presence of a mixture of red lead (minium) and red ochre (iron oxide) in the sample. Also, according to the obtained results, ochre and mixture of iron and manganese oxides were used in red and brown colors. FTIR results showed the presence of organic material only in green, indicating that it was the only reconstituted pigment, but no other organic material was detected in other colors, which may be due to the instability of organic materials during the time. 
Green phthalocyanine copper is a new pigment that may have been used to restore painting. This pigment was first used in 1320 AD, but it is not clear on what date this pigment was used to repair or reconstruct this paint. Due to the presence of oil in the FTIR spectrum of this color, it seems that unlike other colors, oil has been used to close this color, and the technique used in this color is different from other colors. 

Conclusion 
Identification of materials and pigments showed that the paintings are due to the presence of artificial ultramarine, were done in the Qajar period (1789-1925) and presence of phthalocyanine green in green color showed that this mural painting was restored in Contemporary period. 
The result of the analysis showed that the blue color was used in inscription was artificial ultramarine (Na6-10Al6Si6O24S2-4) on a gypsum layer (CaSO4.2H2O). The absence of minerals such as pyrite and calcite in the PLM images indicates that the ultramarine is synthetic. The results of identification of gold color showed presence of copper and zinc alloy in the ratio of 10:1 in gold color. The blue color used in the mural paintings was also artificial ultramarine on a red layer of ochre. The result of micro-Raman showed that green pigment was copper phthalocyanine (phthalocyanine green). A synthetic organic material composed of chlorinated copper phthalocyanine (chlorinated Phthalocyanine blue). Phthalocyanine green was introduced as an industrial pigment in 1938. This pigment is unaffected by light, heat, and chemicals the use of this pigment showed that the mural paintings was restored in Contemporary period. The results of identification of the orange-red revealed the presence of a mixture of red lead (minium) and red ochre (iron oxide) in the sample. Also, according to the obtained results, ochre and mixture of iron and manganese oxides were used in red and brown colors. Identification of materials and pigments showed that the paintings are due to the presence of artificial ultramarine, were done in the Qajar period (1789-1925) and presence of phthalocyanine green in green color showed that this mural painting was restored in Contemporary period. FTIR results showed the presence of organic material only in green, indicating that it was the only reconstituted pigment, but no other organic material was detected in other colors, which may be due to the instability of organic materials during the time.