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Puffed food is grain, potato or beans as the main raw material, through the puffing process made of food. Puffed food is characterized by a significant increase in volume, with a crisp structure and flavor, this type of food appeared in the late 1960 s, also known as extruded food, spray food or light food. There are many kinds of puffed food, including rice cakes, potato chips, shrimp chips, popcorn, rice nuts, etc. The production process of puffed food usually involves humidification and moisture adjustment, baking, frying or extrusion, so that the volume of raw materials expands and the internal structure changes. Puffed food can be divided into baking type, fried type, direct extrusion type and color type and other types.

According to the classification of candies, candies can be divided into hard candies, hard sandwich candies, cream candies, gel candies, polished candies, gum-based candies, inflatable candies and tableted candies, among which hard candies are hard and crisp candies with white granulated sugar and starch syrup as the main ingredients. Hard sandwich candies are hard candies containing stuffing hearts in candies; cream candy is made of white granulated sugar, starch syrup (or other sugar), fat and dairy products, with protein not less than 1.5 and fat not less than 3.0, and has special cream flavor and burnt flavor. Gel candy is a soft candy made of edible gum (or starch), white granulated sugar and starch syrup (or other sugar). Polished candy is a bright and firm candy; Gum-based candy is a chewable or blowable candy made of white granulated sugar (or sweetener) and gum-based substance as the main material. Inflatable candy is a candy with fine and uniform bubbles inside the sugar body. Tablet candy is a candy that has been granulated, bonded and pressed. Consumers in the purchase of candy should pay attention to the following points: 1. It is necessary to buy candy in a regular large shopping mall or supermarket, because large shopping malls strictly control the purchase of the products distributed, the purchase channels are standardized, and the quality and after-sales service of the products distributed are guaranteed. 2. Choose and buy products produced by large enterprises or branded enterprises. These enterprises have standardized management and stable product quality. 3. Check the label and packaging. First of all, observe whether the outer packaging is neat and clean, whether the handwriting is clear, whether the label is complete, whether the product is within the shelf life, and try to buy recently produced products. 4. Evaluate the senses. Normal candies should be (1) uniform color and luster, pure and moderate fragrance, normal taste and peculiar smell, which should conform to the color and fragrance of the product;(2) No visible impurities, no foaming, no deliquescence, no paper sticking, tight wrapping paper, no breakage and packaging phenomenon;(3) Semi-soft candy containing nuts, peanut kernels, etc., no rancidity, no moth, no mildew; soft candy elastic, no melting sticky phenomenon. 5. The surface of chocolate candy is smooth and delicate, without whitish, mildew and burnt taste.