Kerosene

Kerosene is an item that is available in all routes. It is gradually consumed when the player uses the lamp. It may be bought from clothing shops and Bad Grief's lair. It may also be looted from houses.

The player's lamp is not an item that may be dropped or moved, as it is rather an innate ability that all playable characters possess. The default button to activate the lamp is F.

Quote
"Kerosene is used for refilling the lamp."