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When we throw away our shipping label, it becomes dangerous to leave our personal information on the box. When using the safe express sheet, we only have to press the express sheet lightly with our nails to scratch out the personal information. The common shipping label consists of 4 carbonless copy papers. On that basis, we move pressure sensitive pigment oil to the back of the third paper to the front of the forth paper. This way the forth paper becomes self-contained.Then when we press the express sheet lightly with our nails, a black imprint will appear on the paper to cover over our personal information. This simple change in shipping l
Tinghua Lu ,