Silkworm head swallowtail is mostly used to describe the characteristics of official script brushwork, which is dignified in starting and light in collecting. The writing of official script is mainly divided into three stages, namely, starting the pen, turning right and closing the pen. On the main horizontal line, or the main hook, write the swallow tail of silkworm head, also called goose tail.
However, it should be noted that not every word must have a silkworm head dovetail, and each word has only one silkworm head dovetail. When using a pen, you should pay attention to the inside-out of the pen, so as to write a good swallow-tailed silkworm head. Secondly, the main pen should be prominent, and the horizontal and vertical strokes don't have to be straight, but there can be ups and downs.