What is the principle of sunny flowers?

Qingyuhua is a kind of chemical hygrometer, and the change of color reflects the change of humidity in its environment. Because the sunny weather is often related to humidity, it can forecast the weather. What is the principle of sunny flowers?

Experimental steps

1. Take a piece of white filter paper or white paper with strong water absorption, cut it into petal shape, and tie the cut flower into a paper flower with thin thread or fine iron wire. Soak the paper flower in the cobalt chloride solution of about 1 mol/L for a while, take it out and dry it, then soak it in the cobalt chloride solution and dry it, and repeat this several times until the paper flower turns pink.

2. light the alcohol lamp and bake the pink paper flowers on the flame (in order to prevent the paper flowers from burning, you can put an asbestos net on the iron frame and bake it through the asbestos net). The pink of the flower gradually turns blue, and finally becomes sky blue, and the sunny and rainy flowers are made. Hang this flower on the wall, it can forecast the weather.

3. If you are anxious to know whether this flower works, you can spray some water mist on the paper flower, and the blue flower will turn pink immediately, and then it will turn blue after being baked on the fire. Third, the principle.

What is the principle of clear rain flowers

At normal temperature, when you see blue flowers turn pink, it means that the humidity in the air has increased to a certain extent, and anhydrous cobalt chloride has absorbed water and turned into cobalt chloride crystals, and it may rain. If you see the flowers change from pink to blue, that is, the cobalt chloride crystal loses water and becomes anhydrous anhydrous cobalt chloride, it means that the air humidity is reduced and it will clear up.