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CD4060BE 管脚颜色不同 焊接时不容易上锡

上周从MOUSER上买了芯片CD4060BE,发现管脚颜色比较灰暗(之前采购的管脚都是灰亮),焊接的时候比较难上锡,锡炉的温度调高,问题没有明显改善;咨询商家说是TI的制造材料变化引起的,请问下这个有官方的说明吗?由此引起的 不好焊接 有相应的焊接工艺说明文件吗?