Thai colour names used for mural paintings and Khon masks are not well known, uncommonly used, and some are forgotten. They are normally known today only among few artists who inherited the knowledge to paint them from their elders. However, the artists cannot quantitatively describe the characteristics of these colours, and this is a major impediment in colour identification and preservation studies that are necessary for future restoration works of temples and artifacts. The purpose of this article is to describe our research for identifying and quantitatively describing traditional Thai colours, as part of our effort to create a ''Thai Colour Name Dictionary.'' In this article, we show information about colour names which have never been mentioned in any international journal until now, and we describe the method we used to identify them with physical colours. The method is exemplified on 10 colour names.
The major obstacle in identifying traditional Thai colors used in mural paintings is that most exist today only as names in old textbooks. The textbooks mention the name of each color without giving quantitative information about it. Mural paintings in Thailand have never been restored by matching the original colors, and, therefore, it is impossible to gather colorimetric data from any mural painting. Only few artists posses today the knowledge, inherited from their elders, to produce traditional Thai color names from natural pigments. However, there is no general accepted recipe among artists to produce any of these colors by means of pigment proportions and dilutions. For this reason, there is no other way to identify traditional Thai color names except for studying the color characteristics of samples painted by artists who still know how the colors look. Thai mural painting colors will be one of Thai's lost cultural treasures once these artists disappear. Therefore, the identification and quantitative description of these colors became a high priority. In this article, we review the method used in our research for identifying more than half of the studied traditional Thai mural painting colors and describe an improved method for identifying the rest of the colors. We show calculation processes used in the software that we created as part of the improved method. We also suggest a way for restoring the mural paintings, using the identified color names, given the fact that the latest restorations totally destroyed the old paintings in Lampang province.
This research is aimed to introduce and to compare 3 methods of reading out and analyzing light blue radiochromic film (BLF) dosimeter and red radiation-sensitive poly-methylmethacrylate (PMMA). The BLF and red radiation-sensitive PMMA act as a colour detector which its colour changes after being irradiated. These dosimeters are usually used in food irradiation for process control during irradiation process. The camera-based measurement in a constraint condition, scanner-based measurement with the Trichromatic Colour Analyser (TCA) software and spectrophotometer were used for obtaining colorimetric data of both dosimeters which were non-irradiated and irradiated in 5 doses: 5, 10, 15, 20 and 25 kGy. There were strong linear relationships between doses, given to BLF, and lightness (CIE L*), chroma (CIE C*) and yellowness-blueness (CIE b*) for 3 methods. For red radiation-sensitive PMMA, strong linear relationships were found between doses and redness-greenness (CIE a*) as well as CIE C* in both TCA and spectrophotometer methods. The doses and CIE L* gave strong relationship only in the spectrophotometric method.
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