The material below is Open Game Content from a 3PP Source
Candle of Truth
Aura faint enchantment; CL 3rd
Slot none; Price 2,500 gp; Weight 1/2 lb.
This white tallow candle, when burned, calls into place a zone of truth spell (Will DC 13 negates) in a 5-foot radius centered on the candle. The zone lasts for 1 hour, while the candle burns. If the candle is snuffed before that time, the effect is canceled and the candle ruined.
Requirements Craft Wondrous Item, zone of truth; Cost 1,250 gp