What is the principle of the weather forecast bottle? Is it accurate?

The weather forecast bottle is accurate, and the principle is:

The change of crystallization in the bottle is mainly due to the change of solubility of camphor in ethanol solution with temperature. Potassium nitrate, ammonium chloride and water are used to control the continuous nucleation during the high-speed growth of crystals. When the temperature changes, camphor crystals will precipitate, and the speed of temperature change will affect the growth size and structure of crystals. Together, these factors lead to beautiful changes in the crystal morphology in the bottle.

Phenomenon:

In that historic voyage, fitzroy accurately recorded the weather forecast of the storm flask: if the liquid is clear, it means the weather will be fine; If the liquid is foggy, sometimes accompanied by precipitation, then the weather will be as turbid as a solution; If there is precipitation suspended in the solution, it means that the weather is wet or frosty.

If suspended sediment and foggy liquid coexist, it means a storm is coming; If precipitation is suspended in the liquid on a clear winter day, it means it will snow; If there is a lot of sediment in the liquid on a warm day or snowy winter, it will be turbid; If there is crystal precipitation at the bottom of the cup, it means it is going to frost; If there is a spiral at the top, it means it will be windy.