I continued cleaning the ornament with Brasso and more red colour appeared, and this (and other metal characters) really made me think that the material used for making the ornament could be copper. I did a test on a detached chip with potassium sulphide to find the answer.
繼續使用銅油清潔的過程中發現兩件事情，第一件是：花片的材質是紅銅。
兩次使用銅油清潔的過程中，「被棉花棒擦掉的金色」的面積越來越大，甚至整片都是，紅色也越來越明顯；而由著對於幾種常用的銅材質特性的認知vs.眼見所憑，越來越讓人覺得它們應該是紅銅。為了尋找答案，我做了一個小實驗：硫化。
Okay, it's copper.
手邊正好有一片一直以來搖搖欲墜然後終究掉下來了的小小花片碎角。我把它洗乾淨，放進硫化鉀溶液裡⋯⋯秒黑。
它是紅銅。黃銅與青銅不會只因為接觸到硫磺或硫化物就變黑，它們還需要其它的成份。
As mentioned before, I've decided using Brasso to clean the hairpin although it could be corrosive to metals, and it did.... another wire with motif was detached. It's my bad because the metal is so thin and it must be not good enough to clean the Brasso with 1% citric acid solution and running water (pure H₂O) only. Therefore I bought distilled white vinegar and a trigger sprayer and repeat all the steps again: clean the ornament with Brasso → clean it with pure H₂O (fine spray) throughly → pickle it in the vinegar for minutes → clean it with pure H₂O (fine spray) throughly again → clean all the gaps with pure H₂O (jet stream), then sop up the water with a dried towel.
第二件事情是：銅油的腐蝕力不容小覷。雖然它的確幫忙去除了不少花片上的陳年鏽垢，但是經過幾次清潔，殘留在細小縫隙間的微量銅油還是把另一朵小花片給摘了下來⋯⋯在古代我大概已經被殺頭@@
之前用銅油擦過的部件，是用1%的檸檬酸溶液中和，然後再用純水沖洗，但是覺得效果沒有預期中的好（又長了一點銅綠），覺得也許是檸檬酸濃度太低＋只是一般沖洗，部件上仍然有銅油殘留；這次買了蒸餾醋與可調式噴水瓶，刷完銅油之後，先用噴霧功能把花片噴洗過一次，浸泡在蒸餾醋裡（酸洗概念）輕輕搖晃沖洗數分鐘，再噴一次，再用水柱功能把細縫處徹底沖洗乾淨，用濕毛巾按乾。
I left the ornament in the air for few days and there is no more patinas (they were still growing before this cleaning is done). The cleaning is finished now.
處理好了之後又多放了幾天觀察，截至目前為止都沒有再出現新的銅綠，我想這個方法是奏效了～而已經確認是紅銅製的花片，基於物件的狀況與其它條件考量，我暫時決定就保留它現在的樣子，不再進行電鍍上色，雖然金色才應該是這支髮簪原本的顏色⋯⋯超級好奇它原本的金色是如何加工上去、是什麼材質⋯⋯覺得最有可能是鎏金（但是一擦就掉？）。
Next: get the template of each motif in ANY WAY. It's the preparation for Tian-Tsui repairing.
接著我把一些起皺變形的花片微整平，準備進行下一個步驟的前置作業：取得花片的形狀・以進行點翠修復。
To be continued.
待續兒。
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