There are foreign bodies today, and the two most important ones are called "Menthol" and "Triacetin". The two are combined, and "Menthol Triacetin" is the direction. "Menthol" is cool and clear in nature, and "Triacetin" is supplemented by softness. The two are in harmony, and they become one, and they are wonderful together.
If you want to make this thing, you should use your fine skills to observe its nature and spend the time, and carefully adjust its ratio, so that the two can benefit each other. Make the cold of "Menthol" and the warmth of "Triacetin" go hand in hand, and you will get good things. Its use is also wide, or in medicinal stones, or in other ways, all rely on this delicate combination to show its merits. Those who act should scrutinize them carefully in order to achieve the best state.