Preparation method of rosin plaster

2. Boil the pot with high fire, pour the water into the pot and cook it twice, each time 1 hour, and take the liquid medicine once. After the second mixing, concentrate to 200-300ml with slow fire.

3. Add the powder and stir well.

4, add a little sesame oil, put it in a container and put it in cold water, which is equivalent to cooling it.