Advanced Refining
Playtest 3.2 / 4th EdSkill Rules & Full Description
With this skill a character is able to get two doses out of one component. It takes 1 minute per dose of component to use this skill. When a character uses this skill the marshal should note that the component was doubled by placing a “D” on the tag. Reagents cannot be doubled, only Rare Components.
Once doubled, a component cannot be used in sorcery rituals, even if both halves of the component are used. A component that has been doubled cannot be doubled again.