The lemon slices in the picture you provided have been oxidized, so it will be red, generally into this lemon slices have been spoiled, can not be soaked in water to drink, it is not good for the body.

Lemon slices contain a lot of vitamin C, vitamin C is easy to be oxidized, so it will show the color in the picture, that is, we usually say that the deterioration of the lemon slices, such lemon slices can not be soaked in water to drink.

The following is a picture of fresh lemon slices

Expand: fresh lemon and dried lemon difference: fresh lemon and sun-dried lemon are actually similar in function, for example, both of them have a very good function of improving the human heart and brain blood vessels. Only, there will be some differences in the taste of fresh and dried lemons when consumed. In addition, the biggest difference between the two lies in the amount of trace elements contained in them. Therefore, the question of which is better, fresh or dried lemons, is not conclusive.

From the taste, if you like sour taste, you can choose fresh lemon; dried lemon slices in the flavor than fresh to some sweet, so there are some people will prefer the taste of dried lemon.

From the nutritional composition, fresh lemon is naturally more nutritious than dry lemon content, nutritional value is also a little higher. Lemons will more or less lose nutrients in the process of drying, and dried lemons are naturally less nutritious than fresh ones. But in reality, the difference isn't that great.

From the point of view of the use of fresh lemons, fresh lemons can be consumed in a variety of ways, can be used to make water, can also be used as a condiment flavoring, can also be used to make desserts; dry lemons are mainly used to make water, tea drink.

From the point of view of the convenience of consumption, of course, dry lemon is more convenient, you can always take two slices of tea; and fresh lemon cut after the use of incomplete also need to be placed in the refrigerator to save, improper preservation is easy to deteriorate, which vitamin C will also be lost.