Why does honey turn black when tea leaves are added?

When the tea turns black, it indicates that the honey has been contaminated, and the darker the tea, the more polluted it is.

Experts explain: If honey contains free iron.

Too high, iron and tea polyphenols in tea.

A reaction occurs, resulting in a brown precipitate. It will cause damage to the liver, pancreas, and kidneys of the human body.

The brewed osmanthus tea is added with a little honey, why does the water turn black?

Hello dear, it is normal for the color of honey to darken when mixed with tea. The iron content in honey exceeds a certain amount of about 10 ppm, and when it is added to tea, it will react, especially for dark honey. If the free bivalent iron in the honey is too high, the iron will react with the tea polyphenols in the tea, and the combination reaction will occur, resulting in blue-black precipitation, which is visually unsightly, but it is not toxic to the human body.

The iron content of honey is 1--10 mg kg, which is much lower than the amount of iron poisoning in the human body, and the iron in honey is mostly bivalent iron, which will not pose a hazard to human health, and can be eaten with confidence.

"It's actually normal for tea and honey to darken in color. In general, the discoloration is due to the reaction of the phenolic substances in the tea with the metal ions in the honey, which is easy to produce color-forming complexes, but it is not toxic to the human body. Professor Hu Fuliang of the School of Animal Science of Zhejiang University told reporters.

However, different honeys have different color changes because of the different mineral elements they contain, for example, the acacia honey used in the experiment itself is a light-colored honey, and even if there is a reaction, the color is very light, while eucalyptus honey is rich in a large number of mineral elements, so the color of 'ink' will appear. However, it is not scientific to use this as a way to test the quality of honey. First of all, honey itself contains certain mineral elements, such as iron and zinc, which are needed by the human body; In addition, it may also be due to packaging containers and other reasons that the content exceeds the standard, which requires the detection of authoritative departments, and it is not scientific to say good or bad only in terms of color changes.

Professor Hu said. Professor Ye Xingqian of the Department of Food and Nutrition of Zhejiang University also gave a similar explanation for this: "It is normal for tea and honey to change color when mixed, but if the color is very dark, it may also be that bee products are contaminated. ”

Why does tea make honey black water?

There are several reasons why honey turns dark in color:

1. If the color turns black, it may be related to the impurities in the honey, and pure honey generally does not change color;

2. It may be that bee products are polluted, for example, some manufacturers use iron barrels to contain honey, and the honey shaker and processing equipment have not been updated for more than ten years, the metal surface is corroded, and the honey itself is acidic, and the two are easy to oxidize when contacted, so that the honey is polluted. Be careful.

3. Due to the excessive content of the packaging container, the honey has a chemical reaction in the container and turns black. I can't eat it.

Note: If placed in a metal container, or an open container, it will deteriorate and turn black over time. If it is stored in a glass or ceramic container, it will not change color for a long time, but only if it is pure honey.

It can be drunk, and it is normal for honey to darken in color when mixed with tea.

The iron content in honey exceeds a certain amount of about 10ppm, which reacts when added to tea, especially dark honey. If the free bivalent iron in honey is too high, the iron will react with the tea polyphenols in the tea, and the combination reaction will occur, resulting in blue-black precipitation, which is visually unsightly, but it is not toxic to the human body. The iron content of honey is 1--10 mg kg, which is much lower than the amount of iron poisoning in the human body, and the iron in honey is mostly bivalent iron, which will not pose a hazard to human health, and can be eaten with confidence.

In fact, honey tea has many benefits: mouth ulcers, pharyngitis, thirst and blood, lung nourishment and other kidney effects.

If it turns black, it means that it is poisonous, and it must not be drunk.

Generally, the rose tea is brewed and cooled for a while, and then the honey is added, which is a more reasonable diet.

"It's actually normal for tea and honey to darken in color. In general, the discoloration is because the phenolic substances in the tea react with the metal ions in the honey, and it is easy to produce color-developing complexes, but this is not toxic to the human body, but different honeys have different color changes because of the different mineral elements they contain, for example, acacia honey itself is a light-colored honey, even if it reacts, the color is very light, and eucalyptus honey is rich in a large number of mineral elements, so the color of 'ink' will appear.

When the tea turns black, it indicates that the honey has been polluted and disturbed, and the darker the tea, the more polluted it is.

Experts explained: If the free bivalent iron content in honey is too high, the iron will react with the tea polyphenols in the tea leaves, producing brown precipitates. It will cause damage to the liver, pancreas, and kidneys of the human body.