So I'm trying to make a recipe for an LED, and I want it to use rose red, cactus green, and lapis lazuli. As I recently found out though, Minecraft 1.12.2 doesn't call them by their names, but instead minecraft:dye and then a data value (1, 2, and 4). So how do I include this in the recipe? Here is the relevant section of the json file:

 

"key": {
        "#": {
            "item": "minecraft:glass_pane"
        },
        "R": {
            "item": "minecraft:dye"
        },
        "G": {
            "item": "minecraft:dye"
        },
        "B": {
            "item": "minecraft:dye"
        },
        "i": {
            "item": "minecraft:iron_ingot"
        }
    },

 

Okay I managed to figure it out after coming across a different tutorial than what I was using. If anyone else comes across this problem, the solution is to add another field under "item" called "data", and then give it the number. Don't forget to add a comma to the end of the item line! Here's how my fixed code looks:

 

"key": {
        "#": {
            "item": "minecraft:glass_pane"
        },
        "R": {
            "item": "minecraft:dye",
            "data": 1
        },
        "G": {
            "item": "minecraft:dye",
            "data": 2
        },
        "B": {
            "item": "minecraft:dye",
            "data": 4
        },
        "i": {
            "item": "minecraft:iron_ingot"
        }