From Junk Jack Wiki
The inventory outlines option will display a colored outline on the bottom right corner of all items in your inventory.
The outlines color will vary depending upon the type of item.
With this option on:
- Gray: Indicates a Junk. It is useless but sometimes cool.
- White: Indicates a Material. These items are used in crafting something.
- Green: Indicates a Food. These items are anything consumable that heals Jack.
- Red: Indicates a Weapon. These deal more damage to O-Mobs than other items.
- Blue: Indicates a Tool. These are used to break blocks faster.
- Purple: Indicates a Treasure. It is useless, but not worthless. These are rare items.
- Yellow: Indicates a Placeable. These items can be placed directly into the world.