Material: female die for pouring, inner hole about 40 cm, thick glass plate; The main components of rosin are suitable; A little pine putty; A little butter, the proportion: butter accounts for about 2%, and the ash content of pine oil is about1%-15%; A water cup. Boiling rosin can be divided into two methods: steam method and drop method. Drip method is also called indigenous method.

Step: 1. Break the rosin and put it in a proper amount of water glass for heating. After the rosin is completely dissolved, add butter and continue heating, so that the water in the rosin can be completely evaporated. 2. After the water is completely evaporated, add a small amount of turpentine. At this time, cover the cup immediately, stop heating and keep the temperature for about one minute. Step 3 pour the wine. Put the flat side of the concave die down on the thick glass plate, pour the melted rosin into the concave die, and take it out after cooling (the cooling time is about two hours, otherwise it cannot be taken out).