I was attempting get some FC1 with my GSM, to help a newer crafter with levelling by making a Dodore Belt. I have not done this since before 3.1 but I remembered it was about a stack Brass Ingots and Rag Wetstones to produce 10 FC1. Assuming consumption of all material returns too.

My memory has been re-inforced by great work of this thread.
Quote Originally Posted by Nyalia View Post
GSM: Brass Ring of Crafting [r20] (Yield: 0.1) - Crafted: 275; Vendor: 416 (gil/demimateria: 2,750/4,160) (Credit: Mathild Greyashe of Faerie)
Unfortunately, after 141 desynths, I have 6 FC1 and 8 Clear.
Is the formula still pretty much 15% chance of demateria, then split in half between FC and Clear?
My results are closer to 10% dematermia and equal split between FC and Clear remains.
Just bad RNG or have the demateria rates changed?