Porcelain dried dragon imperial seal

There are three kinds of seals on the bottom of Qianlong porcelain: Qianlong year system, QingQianlong year system and QingQianlong year antique, among which QingQianlong year system is the main six-character seal script. There are blue and white, red color, gold color, blue material and so on, as well as engraving. There are six-character double lines, six-character three lines, three lines of circled regular script and so on. There are looped lines and non-looped lines outside the segment, and most of them are not looped lines in the later stage. Blue and white is regular script. When writing seal script, it is generally six characters, three lines and three columns, most of which are large and some are small.