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How to sign the signature column on the back of the bank card? I can't write with a pen, it will drop when I touch it.
The signature on the back of the bank card is optional.

If you sign, you can use an oily black pen or a ballpoint pen. Do not use water-based pen.

Oil-based pen, if it doesn't look good, you can clean it with alkyd thinner. It's sold in the local specialty store, one bottle of 35 yuan. )