Apple itself is violently buckled in the air, and there will be a little oxidation. In addition, there is iron in the barbed wire, which reacts with fruit acid and turns black.

Dried apples, that is, apple chips, are products with water content of about 5% by frying or other methods under vacuum or negative pressure, without changing the shape and color. It contains no pigment, no preservatives and is rich in fiber, so it is a pure natural snack food. Apple, the most common fruit, belongs to Rosaceae, a deciduous tree with oval and serrated leaves. Its fruit is spherical, sweet, crisp and rich in nutrition, making it the top four fruits in the world. Apples are usually red, but there are also yellow and green. Apple is a low-calorie food, which only produces 60 kilocalories per100g. The nutrients in apples are soluble and easily absorbed by human body, so they are called "living water", which is beneficial to dissolve sulfur and make skin smooth and tender. According to the statistics of FAO, in 20 13, the world's apple output was 80.82 million tons, which was higher than that of grapes (77180,000 tons), ranking second in the world (the first was bananas10.067 billion tons). There is no doubt that apple is the king of temperate fruit.