Traditional Culture Encyclopedia - Hotel accommodation - How does rice porridge turn yellow?

How does rice porridge turn yellow?

I don't know whether yellow is the color of rice or water. If you cook porridge with new rice, the rice will be a little yellow or blue after cooking, and the soup will be thicker; If porridge is cooked with old rice, it is still white. To thicken the soup, add one gram (a little bit is enough) of edible alkali!