There are two ways to identify cards: one is magic props, which are marked with special marks or used with props before leaving the factory, such as T-cards, long and short cards and invisible potions.

Second, man-made traces in the later period, such as clip printing and corner folding. Ordinary poker can't recognize any brand.

Different brands of magic playing cards have different signs on the back, so you need to consult people in the industry to understand. Some are sprayed with reflective layers, which can be identified from a specific angle; Some are small marks made by the magician himself, and different marks will change according to personal habits and are not uniform. Ten bets and nine cheats, stay away from gambling.