1. Dissolve caustic soda with water, put water and caustic soda into a container, and stir until the water becomes transparent. It should be noted that foam and heat will be generated during the mixing process.

2. Add oil while stirring. After the caustic soda is completely dissolved, the oil is gradually added while stirring. Stir with a blender for about 10 minute.

3. Pour in red wine.

4. Continue to stir carefully, and continue to stir carefully for about 10 minute until the red wine is completely evenly distributed. At this time, the liquid began to thicken gradually.

5. Inject into the mold, stop stirring, and inject into the mold after two or three minutes.

6. Leave it intact 1~2 days, and put it in a warm place 1 ~ 2 days. At this time, the liquid produces a chemical reaction in the mold. Please don't touch it.

7. Take out the soap from the mold. You can insert a knife or scissors into the mold for easy removal.

8. Finally, cut into squares of appropriate size and put them in a ventilated place to avoid direct sunlight. After more than a month, the production was completed.