Preparation of 1. mixed solution: pour 5-8g sodium alginate, 0. 1g sodium benzoate and 0.3g pigment into 1kg hot water and stir with a wooden stick; After standing for 2-3 hours, stir with a wooden stick for 10 minute to completely dissolve sodium alginate.

2. Preparation of molding liquid: It is made of 20% calcium chloride and 80% water, and then it is poured into a flat plastic tray after being evenly stirred.

3. Preparation: Pour the mixed liquid into a drip pot made of plastic basin, and put the end of the basin on the molding liquid, so that the mixed liquid dripping from the bottom of the basin just drops into the molding liquid. Pay attention to make the dripping mixture look like a broken pearl. After about 20 minutes, the mixed liquid will form round crystal beads in the molding liquid.

4. Treatment method: Take the crystal soil that has solidified into round beads out of the molding solution and rinse it with clear water for several times to make it crystal clear. Pay attention to the light treatment process to avoid destroying the shape of crystalline soil.