I noticed that the molten metals are missing the #c:molten_{material} tags. This applies to all metal variants (Copper, gold, steel, brass, silver, rose gold...). This would help a lot in the compatibility and unification of the fluids.

Here is an example:
TFC Molten Copper:

Slag& Ember Molten Copper:

@ffuentesm this is unrelated but just something that bothered me from the screenshot, you know you didn't give the game a full 8 GB, for that it's 8192 MB