Alchemy test Additive I?

    Hello! I've been leveling my alchemy for a bit, but I'm stuck at the part where I'm doing the promotion test where I have to craft rubies and Additive I. I have no idea what the second one is, and where to get it. Googling didn't give me any useful results either. Perhaps do any of you guys know what it is?

    Thank you for your time!

    Addetive's are items you consume on every craft in order too get 3% more crit chance, You can buy those at the vendor these days. How they are crafted, I have no idea :D