Can ordinary A4 paper be sealed?

Use better printing ink and pay attention to where it is stored.

After the official seal is covered, it will not fade for many years. Because the official seal is dipped in special seal ink when it is used. This printing ink will stick to the official seal more evenly through the mutual pressure between the inkpad and the official seal. Because the official document paper has certain oil absorption, after the official seal is stamped, the ink will be sucked away and float on the official document. In addition, the custody measures of the later official documents will not fade even if they have been stamped with official seals for many years.