Follow along with Izzy as she hunts for dinosaur bones and makes invisible ink In Izzy and the Invisible Ink, Izzy learns to write secret notes. With the ingredients below, you can too Ingredients for the Invisible Ink Experiment: Three pieces of thick white paper; three Q-tips; a glass of water; baking soda; a tablespoon; a 1/4-cup measure; a pen; three cups or bowls; purple grape juice (grape concentrate is best); and a sponge brush.