1. The word "de" in Xuande's regular script follows the ancient style in the Han tablet, and the word "heart" has no middle horizontal. If there is a horizontal character on the word "heart", it is mostly imitated by future generations.

2. Xuande's writing is unpretentious. There are several cases of post-imitators: imitating Song without brushwork, although there are brushwork, the strokes are dull. For example, the imitation of Xuande style in Kangxi period of Qing Dynasty is often similar to Kangxi style.

3. Fragments of the four-character seal script of "Xuande Year System" have been found in the official kiln porcelain site in Jingdezhen, and the complete four-character seal script has been handed down from generation to generation for later generations to copy. Xuande porcelain with "six-character seal script" is not credible.

Extended data:

Xuande's blue and white calligraphy was once said to be full of porcelain dishes, full of money. Others are written on the mouth edge, ear, neck, bowl heart, sole, stream and abdomen according to the different shapes of the objects.

In the early days, it was a four-character seal script, and others mostly wrote regular script. There are six-character models and four-character models. The six-character model includes "the year system of Daming Xuande", the double-circle and double-line regular script model, the six-character horizontal model and the six-character vertical model. Four fonts include double-line and double-circle regular script, four-character horizontal script, four-character vertical script and four-character seal script.

Mainly, the blue-and-white double-round six-character double-line regular script in the center of the artifacts is mostly "Daming Xuande Year System", and the four-character "Zao" and "Xuande Year System" are less used. Most folk kiln wares are written in "Fu", "Shou" and Sanskrit. The structure and layout of fonts are very regular, the spacing between words and the thickness of strokes are moderate, imitating the brushwork of Jin and Tang Dynasties, and having the charm of Yan calligraphy.

Baidu Encyclopedia-Ming Xuande Blue and White Porcelain