1、第一步，取黑豆250克,米醋750毫升。黑豆先用清水洗净一遍，将水倒掉后黑豆放置在一个小碗里。
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2、接着第二步，黑豆清洗后往小碗紫里面添加陈醋，让黑豆浸泡2小时。注意陈醋需要盖住黑豆，太少的话上面的黑豆浸泡不到，会减少效果！
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3、第三步，将黑豆和米醋一起放入锅中,用大火将黑豆煮烂,然后去渣取汁。注意去汁的时候时候要小心别把粘稠的豆倒出。
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4、第四步，滤出黑豆，再熬煮10分钟，汁液粘稠，关火晾凉。滤出黑豆可以用漏勺去舀，这样可以更好的将黑豆滤除。
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5、第五步，涂抹头发，30分钟后洗头，每次染发时可取适量的此药汁涂抹在头发上,半个小时后将头发洗净即可。
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