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 ink sac in Minecraft is shown below:
When Minecraft updated to version 1.13, a changed dubbed "The Flattening" was introduced. In "The Flattening", numerical IDs and item data was removed, and some item IDs were changed to make them more logical - Ink Sac was one of the many items that had their IDs changed.
For this reason, if you're playing on a Minecraft version below 1.13 (1.12, 1.8, 1.7), you should use what we've named a legacy ID for this item. The legacy ID for ink sac is:
Ink Sac has a data value of 0. You will need to add this to commands, along with its legacy item ID (below), to spawn it.
Items from earlier versions of Minecraft were assigned a numerical ID - a unique number to represent it.
The numerical ID for Ink Sac is:
The Ink Sac item can be spawned in Minecraft with the below command. Cheats must be enabled before this will work.