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二、浸泡24小時，可以用手指捏碎黑豆，黑豆汁變成酒紅色。
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第三，將黑豆和果汁放入攪拌機中攪拌均勻。
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4.此時將黑豆和汁倒入鍋中，加適量水煮沸，轉小火煮半小時。水不要放太多，只要能防止鍋燒著就行。
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5.最後加入1碗澱粉，把液態的黑豆汁變成糊狀，塗在頭上就不會掉了。
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6.冷卻後，黑豆染發膏的顏色會變深，從紫色變成棕色，再變成棕色。完全冷卻後，會出現黑色染發膏。
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