What is a black plaster? How to make it? 2

Method for making traditional black plaster

Black Plaster is a lead plaster made of edible fried medicinal materials after deslagging and reacting with Huang Dan at high temperature.

I. Selection of matrix materials and treatment of medicinal materials

1. Vegetable oil: pure sesame oil is better. Its advantage is less foam during refining, which is beneficial to operation. And the prepared plaster is bright in color, sticky and good in quality. You can also use cottonseed oil, rapeseed oil, peanut oil, etc. And soybean oil is not suitable.

2. Huang Dan: also known as Zhang Dan, lead, lead, Dan Tao, orange, heavy and powdery, mainly lead tetroxide, with a purity of over 95%. (available in large pharmacies or chemical stores)

3. Treatment of medicinal materials: Medicinal materials can be divided into general medicinal materials (coarse materials) and fine materials. The coarse materials are roots, stems and leaves of traditional Chinese medicine, and the fine materials are precious drugs and aromatic drugs. According to the formula, take coarse materials, crush them properly, and prepare to boil and remove slag. Grinding fine materials such as Moschus into fine powder, and coating on the surface of plaster; Soluble or volatile fine powder such as borneol, camphor, myrrh, frankincense, etc. It can be ground into fine powder for later use, and put into melted plaster and stir well before application. (Fine powder should pass through 120 mesh sieve)

Second, the production process of traditional black plaster

1. Extraction of medicinal materials (boiling to remove residues): put vegetable oil into a pot, add medicinal materials after slight heating, heat and stir constantly until the medicinal materials are fried to brown on the surface and brown inside. At this time the temperature can reach 220 degrees. After frying, the residue can be removed by wire sieve, and the oil after residue removal is medicinal oil. (It is best to use a copper pot. You can use a special high-temperature thermometer to control the temperature. It is sold in medical equipment stores. )

2. Refining: continue to boil the above medicinal oil. When the oil temperature rises to 320 degrees (it is very important to reach the temperature), switch to medium fire. Refining temperature: first look at the thermometer to reach the specified temperature; The second is to look at the lampblack, which is light blue at first, gradually turns black and thick, and then turns into white smoke, which goes straight up when there is no wind; The third is to look at the oil flower: at the beginning of cooking, the oil flower is mostly near the periphery of the pot wall, which is the degree to which the oil flower gathers in the center of the pot; The fourth is to see a drop of water turn into a bead: take a little medicinal oil and drop it into water to avoid spreading into a bead. (This level is the most difficult. You must refine the oil until it drops into beads, and you must pay attention to fire prevention. The temperature is too high. )

3. Add Dan to the paste: After the medicinal oil is refined, take Dan out of the fire. Generally, about 250 grams of Dan can be added to 500 grams of oil. Before adding Huang Dan, it was dried and sieved with 100 mesh. Add a small amount of Dan, while stirring, be sure to stir in the same direction. Stir into a thick paste, the plaster does not stick to your hands, and it is better to stick to painting. Too hard is old, too sticky is tender.

4. Detoxification: After the plaster is made, soak it in cold water, change the water once a day, and stick it after seven days.

5. Put the plaster ball into a container, melt it in water bath or slow fire, add fine materials, stir evenly, and take a certain amount of plaster on kraft paper or plaster cloth with a bamboo stick. Expensive drugs such as musk can only be sprinkled at last.