There is a morning glory in front of my hometown. I often water it. One day, when I was watering it, I found a problem: I saw it was red in the morning, purple at noon and blue at night. I think it's strange. How can morning glory change color? So, I asked my friend, and my friend said, "Maybe there are too many varieties of morning glory."

I was still not sure, so I went to Baidu. It turns out that morning glory contains an anthocyanin, which is similar to the discoloration principle of purple litmus. CO2 is the least in the morning, so it is red. At noon, with the increase of photosynthesis, the color changes from red to purple. At night, after a day of photosynthesis, the CO2 concentration is the smallest and the color turns blue. The internet also said: ".

I picked a red morning glory from the morning glory in front of the door and put it in the soapy water I made. It was red at first, but it turned dark red after a while. After a while, it changed from dark red to light purple, and after about twenty minutes, it changed from light purple to purple.

In fact, science is around us, and we can find some interesting scientific mysteries as long as we observe it carefully.