There are two ways to do this:
1, hang a live duck upside down, feed pepper into the duck's mouth, and the water flowing out is;
2, taken from tap water or groundwater, put a spell in a bowl, you will have this magical function. It is said that only men can learn, but learning this will have many influences, and the specific influence is unknown.
The materials of symbols are generally stipulated; Painters must use ink or cinnabar, especially cinnabar. Cinnabar is widely used because the ancients believed that cinnabar had the function of suppressing evil spirits.
The carrier of the word is red wood board, because in ancient times, people thought that mahogany had strong exorcism power. Followed by cypress board, jujube board, stone, brick and yellow paper.