Have legal effect. The law does not stipulate what kind of signature to use, as long as it is my signature and the handwriting is clear, it is valid. Even if you sign with a pencil, it is legally binding. Just to preserve the handwriting for a long time, it is generally required to sign with a black pen.

Contract law of the people's Republic of China

Article 31 An acceptance to make an immaterial change in the contents of an offer is valid unless the offeror immediately objects or the offer indicates that the acceptance cannot change the contents of the offer. The contents of the contract shall be subject to the promised contents.

Article 32 A contract is concluded by the parties in the form of a contract, and it is established when both parties sign or seal it. ?

Article 35 Where the parties conclude a contract in the form of a contract, the place where both parties sign or seal is the place where the contract is established.

Extended data

Contract law of the people's Republic of China

Article 52 A contract is invalid under any of the following circumstances:

(1) One party enters into a contract by means of fraud or coercion, which harms the interests of the state;

(2) Malicious collusion that harms the interests of the state, the collective or a third party;

(3) Covering up illegal purposes in a legal form;

(4) damaging the public interest;

(5) Violating the mandatory provisions of laws and administrative regulations.

Article 53 The following exemption clauses in this contract are invalid:

(1) Causing personal injury to the other party;

(2) Causing property losses to the other party due to intentional or gross negligence.

Article 54 One party has the right to request a people's court or an arbitration institution to modify or terminate the following contracts:

(1) Due to a major misunderstanding;

(2) obviously unfair at the time of conclusion of the contract. If one party leads the other party to conclude a contract against its true meaning by fraud, coercion or taking advantage of others' danger, the injured party has the right to request the people's court or arbitration institution to modify or cancel it. The people's court or arbitration institution shall not revoke the request of the parties. ?

As can be seen from the above, there is nothing invalid or invalid in the legal provisions, such as a ballpoint pen and a red pen signature.

References:

National People's Congress-People's Republic of China (PRC) Contract Law