Why does stinky tofu turn black?
22 years old
2018-06-26
I found that many stinky tofu are black in color. Why does the color of stinky tofu become black?
1 Answer These messages are for reference only
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BY Ina Barton 2018-06-26This is related to the raw materials for pickled stinky tofu. After the chemical reaction between ferrous sulfate and sodium sulfide or borax, iron compounds such as iron sulfate and ferric oxide are produced. They are black, which is why water turns black.5
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