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 .