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Grade Classification of Urushi Lacquer (I) Grade Classification of Urushi Lacquer by Traditional Method  

Roh, Jeong-Kwan (Department of Interior Materials Engineering, Jinju National University)
Kim, Yun-Geun (Medical Herb Promotion and Specialization Team)
Publication Information
Journal of the Korean Wood Science and Technology / v.36, no.6, 2008 , pp. 105-112 More about this Journal
Abstract
Grading of the urushi lacquer is quite difficult because of large variations depending on origin, growing conditions, time acquisition, storage conditions. It is urgently required to establish a grading system of urushi lacquer by combining traditional method with scientific methods. Traditional grading of urushi lacquer was done by visual inspection of 10 experts who are working on urushi lacquer industry. Common aspects of the experts were color, odor, viscosity, spread properties on Hanji, color and drying properties on glass based the traditional grading system. In addition, rubbing on Hannj and heating with alcohol lamp was also used to grade urushi lacquer. The grading results of 10 experts showed that chinese urushi lacquer (E) of 7.03, japanese urushi lacquer (C) of 6.84, domestic urushi lacquer of (A) of 6.41 and another chinese urushi lacquer (D) of 5.27, and domestic urushi lacquer (B) of 2.50 in descending order. The degree of spread on Hanji was not consistent among 10 experts. These results indicated that the traditional grading system was pretty much personal and required of developing more objective method based on scientific background.
Keywords
Urushi lacquer; grading; spread on Hanji; odor; sensory test;
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