1. First, make a sculpture out of mud.

2. Then flip the mold.

3. Dig out gypsum (seasoning, according to the ratio of water: gypsum powder = 1:2)

4. Smooth and polish the plaster sculpture.

The specific analysis is as follows:

1. Precisely speaking, medical gypsum can't be used for sculpture, because it dries too fast and is hard after drying, making it difficult to carve.

2. Sculptures are generally made of relatively soft and easy-to-process materials such as clay, net-bound soil and carved oil sludge, which is convenient for continuous modification.

3. After the sculpture is completed, if you want to preserve it for a long time, or copy multiple pieces, you need to use silicone as a mold to copy it. After the mold is completed, you can copy the prototype. At this time, resin and gypsum can be used as copying materials. Ordinary gypsum 10 costs more than 25kg per bag, which is poor after curing.