Universal Dye Kit (UDK) is a very powerful armor and weapon dye kit. It allows you to apply a custom tint to most of your armor and weapons, even to items that are not normally compatible with the game, such as the Sentinel, Hirol, Blackblade, and Golem Shell armors, as well as the helm Duty. You can even create a custom color for your entire party.

The most important thing to keep in mind when using the UDK is that it is an unlimited-use item. It is not like a potion, which only last for a certain time, and it cannot be used by your party members while you are in camp.