1, alcohol;

2, nail polish remover;

3. Eraser with pen signature.

If all else fails, you can only cancel and apply for a new credit card.

Signature on the back of credit card:

1. Although credit cards used in daily life have passwords, with the increase of credit card usage, the risk of password leakage is also increasing. After the credit card and password are lost, checking "countersignature" becomes the last barrier to protect the main credit card.

According to the relevant requirements, the cashier must check whether the cardholder's signature is consistent with the signature on the credit card. If they are different, the consumer transaction cannot be confirmed. It is an irregular operation for a merchant not to check the signature. Cardholders should also establish a sense of safe consumption of credit cards and consciously sign their names on the back of credit cards to prevent them from being stolen.

3. In addition to verifying the "back signature" of the credit card when swiping the card in the mall to ensure the safety of the card owner, when withdrawing money from the ATM of the bank, if the machine has problems and the card is swallowed, the bank staff can also check the signature on the back of the bank card with the signature on the register, so as to handle the card return business.

4. After receiving the new bank card, you should sign on the signature column on the back of the card as soon as possible. The font should be consistent with the usual signature, and try to avoid too neat font, otherwise it will be easily imitated.