[Dolgubon]

ImproveSmithingItem doesn't seem to have any checks on how many boosters can be used. I tested upgrading a white axe to green, and inputting 4, 20, and 50 for the num boosters all went through, and even used that amount of Honing Stones. I don't know if it'll take more than a stack, but I'm not really willing to find out. I especially don't want to find out if there is a lack of checks on upgrading items to gold.

This also works on Jewelry, where you can use two green mats to upgrade to green, despite only requiring one.