The main raw materials are fresh and dried fruits and canned fruits and vegetables, with sugar, citric acid, salt, etc. as accessories. Canned fruit mainly Syrup, sugar category, juice, dried fruit and jam class; canned vegetables are water category, seasoning and so on.

(1) appearance of the container identification 

       Good quality canned - mark clearly visible, clean, intact cans.

       Times the quality of canned food - fake fat listen, sudden angle, rust, clashing, oxidized oil standard, teeth, a single bite, no vacuum and so on.

       Inferior canned - really fat listening, burst section, trachoma, fast mouth, teeth. 

    (2) color identification 

       Good quality canned food - the breed has a corresponding color, uniform, with shiny, bright color. 

       Times the quality of canned food - still have the variety corresponding color, but color is not bright, block-shaped fruits large enough uniform.

       Inferior canned - the variety of color and color inconsistencies due to normal, often dark gray, dull or severe discoloration.

   (3) Identification of smell and taste 

       Good quality canned food - with a unique flavor of this variety, fruit and vegetable blocks with rich aroma, delicious and sweet and sour.

       Times the quality of canned food - still has a unique flavor of this variety, aroma fades, poor taste. 

       Inferior canned - smell and taste is not normal, with rancid taste or severe metallic taste. 

(4) Identification  soup

       Good quality canned food - soup basic clarification, shiny, without peel, pit, Caigeng other impurities present. 

       Times the quality of canned food - soup slightly turbid, there are shiny, but a small amount of residual peel, pit, Caigeng, or other impurities. 

Inferior canned - serious muddy soup or malignant impurities. 

  (5) beat detection to identify 

       Good quality canned food - crisp sound.  times the quality of canned food - empty, muffled sound.  inferior canned - broken gong sound. 

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