The basic attributes for weapons had a pretty good color selection: Red=Fire, Green=Poison, Gold=Money, Blue=Frost, with one conflict that should be fixed: Blue=Leadership. (I propose changing that to white.)
But now, the perks are a mess… So, so many of them are yellow. Purple is unused, green is unused (for perks), gray is unused and the skulls are really basically a duplicate blue when the skull should be gray!
The reason I state this is it makes it easier when we are looking through our very large inventories to identify them by color.