Method steps for making salt crystals:

1. Add clean water into a clean container.

2. Add salt and stir until insoluble salt appears in the water.

3. Hang a string in the middle of saturated salt solution so that crystals can grow along it.

4. Put the container in a place where it won't shake. After 2 or 3 hours, you will see something growing on the rope near the water surface.

5. As time goes on, the water in the container slowly evaporates, and more and more salt crystals begin to precipitate. :

urate crystals, including amorphous phosphate, magnesium ammonium phosphate, calcium phosphate, etc. Often seen in alkaline or nearly neutral urine, it can form a film on the surface of urine.