Pink crystal Crystal Seashells 💝 Clean Shells: Wash and dry your seashells thoroughly. If they are smooth, you can brush a thin layer of liquid glue inside and let it dry to help the crystals stick better. ​ Boil Water: Boil water in a pot (adult supervision required). You need enough to fully submerge your shells in a separate container. ​ Mix Solution: In a heat-safe glass jar or bowl, mix 3–4 tablespoons of Borax powder for every 1 cup of boiling water. Stir until the powder is completely di