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Han purple and Han blue (also called Chinese purple and Chinese blue) are synthetic barium copper silicate pigments developed in China and used in ancient and imperial China from the Western Zhou period (1045–771 BC) until the end of the Han dynasty (''circa'' 220 AD). ==Color== Azurite was the only natural blue pigment used in early China. Early China seems not to have used a natural purple pigment and was the first to develop a synthetic one.〔Thieme, C. 2001. (translated by M. Will) Paint Layers and Pigments on the Terracotta Army: A Comparison with Other Cultures of Antiquity. In: W. Yongqi, Z. Tinghao, M. Petzet, E. Emmerling and C. Blänsdorf (eds.) ''The Polychromy of Antique Sculptures and the Terracotta Army of the First Chinese Emperor: Studies on Materials, Painting Techniques and Conservation.'' Monuments and Sites III. Paris: ICOMOS, 52–57.〕 Han blue in its pure form is, as the name suggests, blue. Han purple in its pure form is actually a dark blue, that is close to electric indigo. It is a purple in the way the term is used in colloquial English, i.e., it is a color between red and blue. It is not, however, a purple in the way the term is used in color theory, i.e. a nonspectral color between red and violet on the 'line of purples' on the CIE chromaticity diagram. Perhaps the most accurate designation for the color would be to call it 'Han indigo', although it could also be regarded as a bright shade of ultramarine (classifying ultramarine as a color and not a pigment). The purple color seen in samples of Han purple is created by the presence of red copper (I) oxide (Cu2O) which is formed when Han purple decomposes (the red and blue making purple).〔 The decomposition of Han purple to form copper (I) oxide is〔Wiedemann, H. G. and Berke, H. 2001. Chemical and Physical Investigations of Egyptian and Chinese Blue and Purple. In: W. Yongqi, Z. Tinghao, M. Petzet, E. Emmerling and C. Blänsdorf (eds.) ''The Polychromy of Antique Sculptures and the Terracotta Army of the First Chinese Emperor: Studies on Materials, Painting Techniques and Conservation.'' Monuments and Sites III. Paris: ICOMOS, 154–169.〕 :3 BaCuSi2O6 → BaCuSi4O10 + 2 BaSiO3 + 2 CuO Above 1050 °C, the CuO copper (II) oxide breaks down to copper (I) oxide:〔 :4 CuO → 2 Cu2O + O2 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Han purple and Han blue」の詳細全文を読む スポンサード リンク
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