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Reproduction of Japanese Traditional Pigment Based on Iron Oxide Powders With Yellowish Red Color

Published online by Cambridge University Press:  21 March 2011

Hiroshi Asaoka ,
Makoto Nakanishi ,
Tatsuo Fujii ,
Jun Takada ,
Yoshihiro Kusano  and
Ryu Murakami
Hiroshi Asaoka
Affiliation:
Department of Applied Chemistry, Okayama University, 3-1-1 Tsusima-naka, Okayama 700-8530, Japan
Makoto Nakanishi
Affiliation:
Department of Applied Chemistry, Okayama University, 3-1-1 Tsusima-naka, Okayama 700-8530, Japan
Tatsuo Fujii
Affiliation:
Department of Applied Chemistry, Okayama University, 3-1-1 Tsusima-naka, Okayama 700-8530, Japan
Jun Takada
Affiliation:
Department of Applied Chemistry, Okayama University, 3-1-1 Tsusima-naka, Okayama 700-8530, Japan
Yoshihiro Kusano
Affiliation:
Department of Applied Art, Kurashiki University of Science and the Arts, 2640 Nishinoura, Tsurajima-cho, Kurashiki 712-8001, Japan
Ryu Murakami
Affiliation:
Nara National Research Institute for Cultural Properties, 2-9-1 Nijyo-cho, Nara 630-8002, Japan
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Abstract

Since the beginning of the 18th century A.D., an artificial iron oxide pigment (hematite, called “bengara” in Japanese) and having a beautiful yellowish red color, has been produced in Japan and applied to pottery, textiles and paintings. However, in 1965 the traditional “bengara” could not be produced anymore, mainly because of environmental pollution. The purpose of this study is to make clear the features of traditional “bengara” and to reproduce high quality “bengara” using modern high-purity reagents. Traditional “bengara” has been characterized as hematite containing a small amount of Al. The average size of the “bengara” particles is approximately 100 nm. The color becomes more yellowish-red with increasing Al content. A monophase of hematite prepared by heating a mixture FeSO4-7H2O and α-Al2O3 to about 680 °C included a small amount of Al substituted in a solid solution. The particle size greatly decreased as the heat treatment temperature was decreased: 100 nm at 770 °C but 50 nm at 650 °C. The color of the particles becomes more vivid as the temperature is decreased, but within bounds this color is independent of the amount of Al in solid solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 712: Symposium II – Materials Issues in Art and Archaeology VI , 2002 , II8.2
Copyright
Copyright © Materials Research Society 2002

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References

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