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Chrome Yellow is lead(II) chromate (PbCrO4). It occurs naturally as the mineral crocoite but the mineral itself was never used as a pigment in paintings. After the French chemist Louis Vauquelin discovered the new element chrome in 1797 lead chromate has been synthetized in the laboratory and its use as a pigment started in the second decade of the nineteenth century.〔Kühn, H. and Curran, M., Chrome Yellow and Other Chromate Pigments, in Artists’ Pigments. A Handbook of Their History and Characteristics, Vol. 1, L. Feller, Ed., Cambridge University Press, London 1986, p. 187 – 204, pp 188-190〕 Because the pigment tends to oxidize and darken on exposure to air over time,〔(Pichon, A. Pigment degradation: Chrome yellow’s darker side ). Nature Chemistry, 5(11), 2013, 897–897. doi:10.1038/nchem.1789〕 and it contains lead, a toxic, heavy metal, it was originally replaced by another pigment, Cadmium Yellow (mixed with enough Cadmium Orange to produce a color equivalent to chrome yellow). Chrome yellow had been commonly produced by mixing solutions of lead nitrate and potassium chromate and filtering off the lead chromate precipitate. The first recorded use of ''chrome yellow'' as a color name in English was in 1818.〔Maerz and Paul ''A Dictionary of Color'' New York:1930 McGraw-Hill Page 192; Color Sample of Chrome Yellow: Page 43 Plate 10 Color Sample L4〕 The Piper J-3 Cub aircraft had chrome yellow as its standard overall color, usually called "Cub Yellow" or "Lock Haven Yellow" in aviation circles, from the Piper factory that existed in Lock Haven, Pennsylvania, where it was made in the 1930s and during World War II. ==See also== * List of colors * School bus yellow 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「Chrome yellow」の詳細全文を読む スポンサード リンク
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