Glow gel
From Vanathul Wiki
description
This slightly viscous liquid is a product of mixing two relatively simple alchemical components. The result is a substance that glows like a torch in a bright yellow hue, and giving off a heat slightly above ambient temperature. Unlike some bioluminescent concoctions, Glow Gel does not fade over time, but rather evaporates away any "spent" liquid as an inert gas.
A bottle of Glow Gel is usually sold in an inert state, along with a capsule of activating agent. A pint will last for roughly a week once activated.
As Glow Gel is an illumination source, it acts similarly to Faery Fire to both the primary target as well as anyone within 5 ft. of it when it lands. This effect last for 1 minute, and may be prematurely ended with a DC 15 reflex save.
A small bottle of Glow Gel costs 25gp (0th level potion), and lasts for about a bell. For the Faery Fire effect a larger amount worth 50gp needs to be used (1st level potion)