Tempura is a great alternative media for mono printing instead of the more traditionally recommended acrylic. It is inexpensive and dries to a flat matt finish that makes is a preferable surface for art journals since the matt is easier to write on.
Squirt small dots of three colors on the printing plate and spread with a brayer. Be careful not to over-blend the colors. Make impressions as desired. Here I used oversized foam stamps. The paint on the stamp can be pressed on another sheet of paper or journal page. This has clean the stamp while also decorating another page. The brayer also can be cleaned by rolling it on a fresh journal page.