Chromomancy Dice are premium resin that magically change color with the heat of your hand as you play. Every set is like having two sets! Ninja Dice start as Ninja Black while room temperature, but magically turn Stealth Purple when heated by the heat your hand! Fully laced with holographic micro glitter throughout, these dice are stunning in both colors, and especially stunning halfway between colors. A must own dice set! To change a die's color: Hold in your fist for several minutes to allow the heat of your hand to transfer fully throughout the thickness of the die. May take 1-5 minutes depending on how warm your hands normally run. If your hands are ""always cold"", you may require the help of some warm tap water to get the job done. Color change lasts 5-20 minutes depending on the ambient temperature in the room as the dice cool again. Made of high-impact resin, with the same casting process we invented for Halfsies Dice in 2013 that prevents air-bubbles from forming inside, even Gate Keeper Games Chromomancy Dice bear the honor of being the heaviest, densest, and most well-balanced resin dice on the planet