Red Line / Seal

When we need to issue a certificate, and sign a contract case, we have to use a seal.So the seal is an indispensable part of our lives. Before covering the seal,we allways put the seal over to have a look for ensuring that the imprint we covered not crooked.Maybe we have checked out,but the results aren't that we want. Red Line is designed for the drawback.
There is a red line on its top surface ,extending to the side of the seal. When you cover the seal, the red line and the edge of the paper parallel under the condition that you needn't to check the bottom surface. Congratulations ,the seal you covered is perfect!