Four-color printing of those colors!

I feel dizzy. These four colors are cyan, magenta, yellow and black. Corresponding to c, m, y and K. White is a spot color. It means a special color. For example, silver and gold are colors that cannot be synthesized by four colors. Of course, if your paper is white, you can also hollow it out, that is, that part is not printed. But it is only suitable for larger places. If it is small print, it should be printed in spot color, because small print is not so easy to register. So try not to use white characters.