You can learn this by having apprentice 2+ in gathering and talking to the chief in velia thus starting the quest chain

As far as I know it's linked into a quest chain, obtainable quest -> http://bdocodex.com/cn/quest/2100/31/

Talk to Ficy (http://bdocodex.com/cn/npc/50210/) She will give you the quest learning higher processing skills (http://bdocodex.com/cn/quest/2100/28/), the subgoals will yield this knowledge.