Light in a Bottle. Right-clicking with it will release a Gaseous Light - quite the opposite to Gaseous Tenebrae. Which can be used to mitigate the effects of Gaseous Glowstone.
"You have studied the intricacies of the Light, and found a way to create completely invisible light by infusing Glowstone with the raw flame.
This phial contains a concentrated extract of Gaseous Glowstone, that can be released through a right click, and will spread relatively fast in the nearby area, lighting it up."
Required Research: Nitorek