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INA105: INA105KP在得捷上买的,DC21+,为什么引脚发黄,这种DIP封装的是正常工艺吗

Part Number: INA105

这个引脚看起来像氧化,实际不是氧化,用棉签沾酒精可以擦掉,可以看擦拭前后对比图,这种是正常工艺吗?这个封装之前也见过很多这样,而且还是官网买的。有官方文件说明吗?谢谢!