Slowburn
Slowburn is a clear and odourless alchemical liquid that can be spread on wood, coal or any other combustible substance.
Ultimate Equipment Guide II
Author Greg Lynch, J. C. Alvarez
Publisher Mongoose Publishing
Publish date 2005
It can also be mixed with oil. Anything treated with slowburn will burn for twice as long as normal, therefore, a torch treated with slowburn will burn for two hours instead of one hour. However, this benefit is not without its drawbacks. Slowburn works by cutting the rate of combustion in half, which also halves the amount of heat produced by the fire, as well as the amount of light produced.
A torch treated with slowburn will burn for twice as long, but it will only provide enough light to illuminate a ten-foot radius. Treating a torch or a pint of oil will require approximately one ounce of slowburn to achieve the desired result. Slowburn is often carried not only by adventurers seeking to prolong their light sources in the darkness of the dungeon, but also by travellers journeying through an area where firewood might be scarce.
Mixing slowburn with alchemist’s fire is unwise, as the alchemical properties of the two are incompatible. They will render each other inert on contact.
Slowburn: 1 gp per ounce