Is it important that the onion has to be organic for a painting? I don't know. The real idea behind this painting is that I want to present two colors: green and purple. I may generate some disturbance here. Obviously, these are two very different colors. However, I consider these two have a similar color temperature. Generally speaking, it is hard to say which one is cooler or warmer. I have held this opinion for a long time, and I have openly spoken about this at my previous workshop. If you are a color theorist, I am very interested in your comment about this issue.