【科普】罐头内壁的黑点黑斑
省流：防锈涂层破损导致罐头内容物和马口铁发生反应。https://img2.doubanio.com/view/group_topic/m/public/p670983221.webp
https://img1.doubanio.com/view/group_topic/m/public/p670983218.webp
https://img1.doubanio.com/view/group_topic/m/public/p670983220.webp
这种罐头已经不能吃，退了之后丢掉，此问题多发于catz和金交。
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