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SN74AHC245: why the pins of SN74AHC245DWR are black not silver

Part Number: SN74AHC245

Hi,

I bought some pieces of SN74AHC245DWR, and found the pins of them are all black.

I want to know if the pins are black or silver, if silver, why the pins are black? Is it oxidizing?

Looking forward to your reply, thank you.