Identify based on fabric selvage, trademark and seal.

1. Identification based on the fabric edge: the front edge of the fabric is smoother and crisper than the reverse side, while the edge of the reverse edge is curled inwards.

2. Identification based on trademarks and seals: When the entire fabric is inspected before leaving the factory, the product trademark paper or instruction manual is affixed. The affixed side is the reverse side of the fabric, while the unattached side is the front side.