• Title/Summary/Keyword: Glue-alum sizing

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A Study of Weather Resistance on Dancheong Ground Treatment of Tranditional Wooden Building in Korea (한국 목조건축물 단청 바탕처리에 대한 내후성 연구)

  • Kim, Young Kyun;Han, Kyeong Soon
    • Journal of Conservation Science
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    • v.35 no.5
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    • pp.480-493
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    • 2019
  • In this study, the method for processing glue and glue-alum sizing from the dancheong ground treatment was evaluated with respect to weather resistance, and its effect on the conservation of dancheong was analyzed. Viscosity and pH of the glue and glue-alum specimen were measured and classified into three categories(none layer, glue layer, and glue-alum layer), which were further classified according to low concentration(four times for 2%) and high concentration(once for 10%). The base layer formation was subsequently classified into three categories based on pigment adoption, namely, Noerok(celadonite), Seokganju(terra rossa), and Jangdan(red lead). The completed specimen was subjected to a changing-environment experiment for evaluating weather resistance and observing the surface. Color variations were analyzed before and after the experiment. The results indicate that glue-alum sizing comprising 5% alum or 7% alum has strong acidity that can affect the life of dancheong, and the high level of 7% alum makes it difficult to create a solid coating layer. After ultraviolet irradiation, the specimen with 7% alum changes its color to yellow. Furthermore, after moisture absorption and drying, cracks can be observed on the entire specimen surface that corroborate the physical change. Additionally, gas-based corrosion causes marginal surface changes. Hence, the formation of a stable coating layer can be achieved by incorporating a low concentration glue solution that is almost neutral, and the application of glue-alum sizing having 2% concentration can aid in the conservation of dancheong.

Effect of Glue and Alum Mixing Ratio on the Color Variation of Traditional Sizing Hanji (아교포수 방법이 전통한지의 색상 변화에 미치는 영향)

  • Lee, Yu-Ju;Choi, Tae-Ho
    • Journal of Conservation Science
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    • v.35 no.2
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    • pp.153-158
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    • 2019
  • The traditional sizing treatment for the Hanji is performed to give the following functions. Those are to stabilize the paint of the painting, to prevent the paint of painting and moisture from smearing into the painting itself, to prevent the paint of the painting and moisture from passing to the lining paper, and to make the colors of painting match the surrounding.This study analyzed a result of the effect of Hanji sizing characteristic according to glue and alum mixing ratio and applying times, affects to pigments of painting and fastness of Hanji using accelerated aging test. As a result of color measurement of sizing treated Hanji, the concentration of glue and the number of application increased, the brightness and the $L^*$ value decreased but the yellowness index increased.