Unverified80% confidenceDecision RuleTime unknown
选购干海带看表面白霜：适量白色粉末是甘露醇（天然甜味物质）属正常，但发黄、发红或有霉斑是变质，色泽应为墨绿至深褐、叶片完整不碎
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80%
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Long-term
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Unverified干海带以叶片厚实、色泽墨绿或深褐、表面有白霜（甘露醇析出）为佳，白霜非发霉，泡发后韧而不烂说明褐藻胶含量高86% similarUnverified优质茯苓断面应为纯白至类白色，颜色发黄或有灰褐色斑点说明存放过久或受潮霉变，颜色异常洁白发亮则需警惕硫磺熏制85% similarUnverified纯葛根粉正常颜色为微黄白或略带灰的天然色，颜色纯白到发亮需警惕漂白或掺淀粉；优质葛根粉呈不规则片状/碎块结晶而非均匀细粉，均匀细腻的多为经过加工或勾兑85% similarUnverified优质麦冬应为半透明浅黄白色、颗粒饱满两头尖、断面角质样有粘性；若颜色发暗褐、表面干瘪起皱、或异常雪白发亮，前者为陈货或霉变、后者疑似硫熏漂白，均应避免84% similarUnverified干海带表面的白色粉末是甘露醇（正常结晶），并非发霉；而绿色、黑绿或发黏则是变质或漂染，应避免购买83% similar
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