吶喊為挪威畫家愛德華·孟克的作品，其呼喊的「怪異」樣貌形象非常鮮明。974Please respect copyright.ＰＥＮＡＮＡf43XLxsZ28
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他本人在1893至1916年畫出多個版本，而其中一幅展示在孟克美術館（Munch Museum)的版本因多處黃色地方出現變白及脫落跡象關係（圖1的數字標記區域），自2006年起已甚少公開示人。974Please respect copyright.ＰＥＮＡＮＡZDuVSJQ5WI
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作品現時正處於光線陰淡、攝氏18度、相對濕度約50%的環境備受保護。974Please respect copyright.ＰＥＮＡＮＡYdFb2apUTu
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（圖2）為了解箇中顏料變色及脫落的機制，有科學家對吶喊作品作出深入研究，並在近日發表文章講述得出的結果（Ref1)。974Please respect copyright.ＰＥＮＡＮＡ46m2XsPkmZ
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Cadmium sulfide，為該時期常用作為黃色顏料的化學物。974Please respect copyright.ＰＥＮＡＮＡ2Z5buh94qX
974Please respect copyright.ＰＥＮＡＮＡasR3quRp4S
同期的文森·梵谷 (Vincent van Gogh)、詹姆斯・恩索 (James Ensor)和亨利·馬諦斯(Henri Matisse)均有利用這種化學物所製成的顏料，而相關的作品亦有出現黃色顏料變白的現象。974Please respect copyright.ＰＥＮＡＮＡNCRii9WsJq
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該時期主要有兩種方式製作Cadmium sulfide，分別為Dry及Wet Method。974Please respect copyright.ＰＥＮＡＮＡji223zkpxR
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Dry Method為以300°C至600°C及零氧氣的方式，加上大量硫元素(Sulphur)調配Cadmium sulfide的方式，得出的成品相對上較為純正。974Please respect copyright.ＰＥＮＡＮＡT76611yBVF
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Wet Method為將不同的化學物混合在一起（如圖中所示），再以沉澱的方式獲取固體Cadmium sulfide。974Please respect copyright.ＰＥＮＡＮＡcvB7na0GG5
基於當時技術相對上不太先進，最終的產品會含有較多雜質及副產品。974Please respect copyright.ＰＥＮＡＮＡGRmYaDchOs
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（圖3）科學家在文中嘗試挖取微量的吶喊畫碎粒，再利用各種技術檢測畫中的化學物成份。974Please respect copyright.ＰＥＮＡＮＡnPV34qiC7K
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圖3中間的圖片，其紅點代表黃色顏料Cadmium sulfide的存在。974Please respect copyright.ＰＥＮＡＮＡvN1MXVXUvF
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下方的圖片，其三種顏色的出現分別代表Wet Method的副產物。974Please respect copyright.ＰＥＮＡＮＡj1kfKFjDL8
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紅點:Cd(OH)Cl974Please respect copyright.ＰＥＮＡＮＡyrqVdW3ykr
綠點:CdSO4974Please respect copyright.ＰＥＮＡＮＡvvCmIcZ9MZ
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這三種副產物，在長久而來的知識中已被確認是顏料變色及脫落的兇手，與吶喊作品所出現的現象不謀而合。974Please respect copyright.ＰＥＮＡＮＡKYgfy3OxMj
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（圖4）為進一步了解顏料變色的現象，他們找來了吶喊畫同期帶有黃色顏料的作品(他們已7914數字命名樣本)。974Please respect copyright.ＰＥＮＡＮＡCWeZSyC9Tr
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拿取畫中碎片後，（圖4左方）他們同樣發現裡頭含有Wet Method的副產物（綠點）。974Please respect copyright.ＰＥＮＡＮＡilfMi7YSPX
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為了解環境因素對於顏料變色的影響，他們對另一塊畫碎用上90 日相對濕度≥ 95%，攝氏為40°C，無光環境來模仿歲月的摧殘。974Please respect copyright.ＰＥＮＡＮＡ8aWTVOR7Am
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他們發現得到Wet Method的副產物Cd(OH)Cl（綠點）數量大增且集中在一起，其目測得到黃色顏料變白的現象發生。974Please respect copyright.ＰＥＮＡＮＡKx4hnqPLDR
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然而，用上用上90 日相對濕度=45%，攝氏為30°C，300W光源直接照射的環境來模仿歲月摧殘的話，則沒有感測得到Wet Method副產物的產生和顏料變色現象發生。974Please respect copyright.ＰＥＮＡＮＡ1G24jmY52M
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（圖5）另外，他們亦對愛德華·孟克那時期捐贈予館舍的顏料油作出檢測。974Please respect copyright.ＰＥＮＡＮＡdJbGAGIcW1
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在畫紙塗上顏料油後，已能測量得到有一定程度份量的Wet Method副產物Cd(OH)Cl（左圖綠點）。974Please respect copyright.ＰＥＮＡＮＡhp4ql8voiP
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（右圖）用上90 日相對濕度≥ 95%，攝氏為40°C的方式摧殘後，綠點數量大增且集中在一起。974Please respect copyright.ＰＥＮＡＮＡZoeL8KYfSG
974Please respect copyright.ＰＥＮＡＮＡAWlY7yf9bK
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（圖6）換句話說，當時期以Wet Method製作的Cadmium sulfide顏料以及愛德華·孟克所使用的顏料油，乃是導致畫中黃色地方出現變白及有脫落跡象的元兇，而其變色的機制主要由相對濕度和溫度而非光線控制。974Please respect copyright.ＰＥＮＡＮＡkp5OEq7bpM
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基於這發現，在相對濕度及溫度嚴密的控制下，吶喊他日將來也許會有機會可以再度長期公開示人。974Please respect copyright.ＰＥＮＡＮＡDbuuL82YFK
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。974Please respect copyright.ＰＥＮＡＮＡJYqkPqbGro
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc974Please respect copyright.ＰＥＮＡＮＡyxZynpbOXU
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」，以課金的方式推動我繼續搜羅資料寫文，多謝。974Please respect copyright.ＰＥＮＡＮＡT5CXrDpit3
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Link:974Please respect copyright.ＰＥＮＡＮＡsviGN4XMnW
https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio974Please respect copyright.ＰＥＮＡＮＡE2uHTVWDWC
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。974Please respect copyright.ＰＥＮＡＮＡHhBsTuMqtz
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Ref1:https://advances.sciencemag.org/content/6/20/eaay3514974Please respect copyright.ＰＥＮＡＮＡwkjjgv0y46
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