1. First check whether the outer package of the iron can is clean, whether the handwriting is clear and smooth, and whether the label is intact and regular. If the soldering tin at the welding point of the can wholesale can is incomplete and uneven, and there are iron tongue, glue flow and other phenomena at the curling edge; If the iron cap on the glass bottle is rusted, it may be inferior.
3. Check whether the color is natural. If the color of canned food is not natural and the color is too beautiful, it may be that the pigment is used beyond the standard.
If the soldering tin at the welding point of the can wholesale can is incomplete and uneven, and there are iron tongue, glue flow and other phenomena at the curling edge; If the iron cap on the glass bottle is rusted, it may be inferior.