1. 白 (bái): This is the most common way to spell "white" and is used as a general term for the color white. It can also refer to the color of paper, snow, and other things.
2. 白色 (báisè): This literally means "white color" and is used in more formal contexts or when you want to emphasize the color.
So, depending on what you want to say, you can choose either "白" or "白色".