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藕汤为什么变红了

更新时间: 2020-10-19 00:00:00     

因为藕当中含有一种鞣质,鞣质经过空气的氧化,就会使藕变成红色。

当藕煮的时间过长,因为水当中也有氧,这样也会使藕变成红色,所以煮藕的水也变成了红色。

关键词: 为什么

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