Description
Make gaseous reagents dramatically tint or fog-up the area within the vat.

Problem This Addresses
This allows certain gases to be more clearly visualized in vat mixtures. It'd also be an interesting way to visualize certain reactions.
Additionally, it'd be interesting to see liquid condense and drip from the top or sides of the vat when glass is used as an material.

I think the visual side of reactions should be exaggerated more, to match the similar level of visual coherence that Create is known for. Lots of these chemical reactions are a bit difficult to visualize for newcomers. Making certain elements or compounds more colorful might help.

Minecraft Username
rocktobot

Gases showing up is already implemented in 1.0. I was also already tentatively planning to add more particle effects as things happen in vats, so I'll up the priority on that,