Each item in Minecraft has a unique ID assigned to it, known as an item ID, this can be used in commands to spawn the item into the game. The item ID for blue dye in Minecraft is shown below:
The Blue Dye item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.
Find thousands more items on our complete list of 1,325 Minecraft IDs.All Item IDs