1, the color of the ink is different: if you look at the reflective place, if it is a real signature, the ink will protrude and be insoluble in the paper itself. When printing, the signature is integrated with the paper itself.

2. Take water to rub: if you can't rub it off, you can rub it off and sign it.

3, the strength is not the same: you can check the protrusions on the paper, and the autograph is more powerful.