Why did the yellow rose turn red? Zou Shunhua, Class 5 (2), Qintong Experimental Primary School, Jiangyan City, Jiangsu Province, I am in Grade 5 this year. There is a problem that has been echoing in my mind and has not been solved. There is a strange Chinese rose in my grandfather's house. During the flowering period, when the Chinese rose just blooms, the color is golden yellow, but after a few days, the edges of the outer petals gradually turn red, and all the petals gradually turn red, and some petals just change the edges. Many people have been asked this question today, and the answers are different. My sixth-grade brother said that petals meet acid rain, and some plants turn red when they meet acid. Then my grandfather's family has other flowers besides this rose pot. There are many colors. Why don't those flowers change color? Some people say that this kind will turn red after being exposed to the sun. So why does the sun change color after irradiation? It is also said that the change of temperature makes the yellow rose turn red. I have also asked many old people, but they all think my questions are ridiculous and can't be answered. I think we have done a lot of experiments in science class under the guidance of our teacher, and we can understand some truth in the experiments. We should solve this problem through our own experiments. First consider whether it is related to acid. I sprinkled some white vinegar on the newly-opened yellow Chinese rose. After several days of observation, the yellow rose has not changed. This shows that the red color of yellow rose has nothing to do with acid rain. At this time, someone reminded me to check online and Baidu, and there was no conclusion. I will post the question on the internet to seek the answer. In less than a day, many fans answered. Some say: related to the environment, the surrounding temperature, humidity, light and so on. It is also related to the pH of fertilizer and water. He believes that the temperature difference may be the main reason for the discoloration of Chinese rose, and the change of temperature leads to the synthesis of pigment. Light is also the cause of color change. High-quality light will make the color more beautiful, while strong light may cause decoloration. Soil composition may also cause color changes, especially some chemicals that flowers can absorb. There are many studies on this phenomenon in Japan. It may also be the degradation of species. Due to continuous cultivation or fatigue production, some varieties will degenerate, which will be reflected in color. So, what are the conditions for the yellow rose to turn red? Based on the above different answers, I think the reason why Chinese rose flowers change color may be related to the sun. So, I took a new pot of Chinese rose to my bedroom and wrapped it in a black plastic bag. As a result, the yellow Chinese rose did not change color obviously after a few days. Through experiments and inquiries, I seem to have found the answer. Yellow roses are very bright when they first bloom. Due to the sun's irradiation, the yellow pigment is reduced, and the rose itself has green pigment. When green pigment and yellow pigment reach a certain proportion, they will turn red. We mix green pigment with yellow pigment, and red appears. Friend, is this conclusion correct? Do you have any more reasonable explanation after reading this article? Please tell me.