Deadrik/TFCraft — pull request #620 by fuami (2014-10-15 15:51:31+00:00)
Title: Failed Vessel Smelting yields Unknown Alloy.

Changes balance by making invalid ratios yield unusable unknown metal.

I think based on the functionality of this in the crucible this would make sense, but I can also understand why you not want to do this since it punishes players for messing up the mixture.

Up to you :)