1, the real card can transmit light to the light.

2. There will be small protrusions around the real card (you can touch it by hand if you can't see it). It may not be in the middle, but it must be. If there is no basic judgment, it is false.

3. After the real card is photographed with a mobile phone, the pixels of the enlarged picture are clear and uniform. It can be seen that the small card is this neat and smooth diamond lattice. If it is positive, it will not break where there is a necklace, and the lines of the mandibular line are also very clear. Besides the white line, there is also such a diamond pattern on the back.