Journal of Materials Life Society
Online ISSN : 2185-7016
Print ISSN : 1346-0633
ISSN-L : 1346-0633
Volume 16 , Issue 1
Showing 1-5 articles out of 5 articles from the selected issue
  • Akiya NAKAMURA
    2004 Volume 16 Issue 1 Pages 1-6
    Published: January 31, 2004
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • Kazuhiro SATO
    2004 Volume 16 Issue 1 Pages 7-12
    Published: January 31, 2004
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • Katsuhiro AOKI, Masao OKAMOTO
    2004 Volume 16 Issue 1 Pages 13-16
    Published: January 31, 2004
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • Masatomo MINAGAWA, Yusuke NAKANO, Tomochika MATSUYAMA, Nobuhiro SATO
    2004 Volume 16 Issue 1 Pages 17-21
    Published: January 31, 2004
    Released: April 19, 2011
    JOURNALS FREE ACCESS
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  • Using Self-made Smalt with Various Compositions of Cobalt and Potassium
    Junkco AKIYAMA, Masamitsu INABA
    2004 Volume 16 Issue 1 Pages 22-27
    Published: January 31, 2004
    Released: April 19, 2011
    JOURNALS FREE ACCESS
    Smalt is a pigment that consists of ground blue potassium glass with cobalt as coloring agent. It has been recognized that some smalt in paints had the tendency to discolor, but the mechanism of the discoloration has remained unknown. In this paper, we investigated whether five kinds of smalt made by the authors (self-made smalt) with various compositions of cobalt and potassium would show the different influence on drying and discoloration of the drying oil (linseed oil) with smalt. Linseed oil samples with five kinds of self-made smalt were heated at 110°C for up to 336 hours respectively and the amount of fatty acid component in the oil samples and the visual color changes of them were measured. Higher content of cobalt in smalt accelerated the drying of the oil while higher content of potassium in smalt slowed it. On the other hand, visible absorption spectra showed that higher content of potassium and lower content of cobalt in smalt caused greater discoloration of the oil. Thus, it was clear that the extent of drying and discoloration of the oil with smalt is influenced by the content of cobalt and potassium in smalt.
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