My bad!
In the 'Tales of' series, there are items called Rune Bottles, which you can use to modify an item.
When you select a Rune Bottle from the inventory, some items (The ones that can be modified) Turn a shade of green, while others remain white.
Upon selecting one, it changes.
In most games, Rune Bottles can either:
A) Upgrade a healing item to its stronger variant (30% HP recovery item changes into a 60% HP recovery item)

Reveal scrolls (More often than not, you find objects called '? Armor' or '? Weapon', and upon contact with a Rune Bottle, they reveal themselves)
C) Make an item its opposite (Turning ice rings or dresses into their fiery variant)
I think it's a really creative mechanic, even for its time (Late 90's) And I wanted to know if I could implement it into the game I am making.