Vanishing Ink For Gags & Practical Jokes This tube of vanishing ink is the perfect novelty for gags, practical jokes and ditty bag gifts. The ink inside whites very fluidly, and even allows for a decent amount of flair. It spreads and you can paint it if need be. Then it fades again within a few minutes of exposure to air. It’s a great way to misdirect someone or create a personalized gag. You could even use it to send secret messages. A 4.5-Inch Vial Of Disappearing Ink This squeezable tube of disappearing ink is only 4.5-inches long. It’s just the right size to fit in a pocket, up a sleeve or palm with a little sleight of hand. Not to mention being sleek enough to slide into a gift bag at the end of a birthday party. Whatever you want to use this vial of disappearing ink for, it’s easy to carry and transport.