Unverified88% confidenceDecision RuleTime unknown
真黑豆表皮有天然蜡质光泽但不刺眼，用湿纸巾擦拭掉色轻微为正常花青素；若纸巾被大面积染成蓝黑色且反复擦不净，为人工染色（常用皂角、墨汁）
1
Sources
88%
Confidence
Long-term
Relevance
-
First Seen
Sources
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Unverified黑芝麻掺假常见染色假货，鉴别方法：用湿纸巾搓不掉色为真，掉黑色属染色；真黑芝麻断面为白色，全黑或深灰断面可疑82% similarUnverified真黑豆表皮乌黑但豆脐（种脐）多为白色或浅褐色；若豆脐也呈深黑色需警惕人工染色，可用湿纸巾擦拭或温水浸泡，掉色明显说明染色掺假（常用黑芸豆冒充）81% similarUnverified黄黑皮/橄榄皮适配纯度低的莫兰迪色系（灰粉、豆沙、燕麦色），高饱和荧光色（正黄、荧光绿）会放大肤色的暗沉与蜡黄79% similarUnverified色泽均匀度反映干燥工艺，优质玉竹片色泽金黄或黄白一致、油润有光泽；出现大量黑斑、褐斑或色泽杂乱不均的多为陈货或干燥不当，有效成分流失且可能霉变78% similarUnverified干桑葚看色泽与结块：优质干品应为紫黑至黑褐色、颗粒完整不结硬块；发红或偏褐说明晾晒不足或陈货，硫熏货则色泽异常鲜亮并有刺鼻酸味78% similar
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