The tea's color alters as you cook it. It transitions through a variety of shades of brown, red, and blue. If you want the color of the tea to be bluer, you can cook it for half an hour. Moreover, the blue color is merely seen as a refraction of light. If you wish to have an even more intense shade of blue, pour the tea in a clear water bottle or glass and hold it near the light. This will help you see the blue hues of the tea.