紫色可以是從紅加藍而成,這是無容置疑。511Please respect copyright.PENANAtg1atYcNmG
但古時候的人又是從甚麼途徑獲取紫色顏料呢?511Please respect copyright.PENANAGRuE0VIW5d511Please respect copyright.PENANAgBzxcgJsUd
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(圖2)紫色顏料其中的一道渠道,就是從骨螺而來。511Please respect copyright.PENANA40JiI9BCMx511Please respect copyright.PENANAFGKS2ua2fV
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顏色的來源當然並非來自骨螺外部,而是來自內部一道名為鰓下腺(Hypobranchial gland)的器官。511Please respect copyright.PENANAyzW9U0tked
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提取過程相當複雜,而且顏色最終的光澤將取決於骨螺的新鮮度,平均來說每隻骨螺最終只可提取得到約0.9克的顏料。511Please respect copyright.PENANAfSUQlR17oG
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(圖3)從以色列南部找出屬於約3000年前(鐵器時代)的紫色羊毛纖維中,找到骨螺鰓下腺器官內含的6-monobromoindigotin和6,6-dibromoindigotin的化學物質,進一步引證從骨螺提取紫色顏料的證據。511Please respect copyright.PENANAQADpeUHCuz511Please respect copyright.PENANAOPCSLRg1wH
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據稱,從骨螺而來的紫色染料一律將被命名為True Purple或是Royal Purple,對比其他來自植物或礦物得來的紫色染料,較不容易會褪色。511Please respect copyright.PENANAxHqGg0PH5v
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延伸閱讀:深入淺出–以化學角度審視吶喊名畫511Please respect copyright.PENANAM6fFg31X80
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Ref1:https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0245897#pone.0245897.ref007511Please respect copyright.PENANAlSFoKIvAjd
Ref2:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6562550/511Please respect copyright.PENANAx6uXDtpGY2