Flux

Flux
Description
Type	Potion
Capacity
Weight	0.2 Stones
Hitpoints
Stamina
max Speed
Tracking
Behavior
Tamable	No
Length	2
ID 476

Flux, like naphtha, is one of three properties a herb could potentially have. It is used in the creation of steel and mortar. You need to achieve Herbalism level 60 to be able to find the Flux property.