In termites trail pheromone is produced from

In termites trail pheromone is produced from Sternal Glands.
In termites, the sternal glands are known to secrete trail-following pheromones in neuter castes and sex-pheromone in some adults.
The sternal gland discharges pheromones when it presses against a substance. There is a chemical in ballpoint pen ink that is similar in composition to the trail-following pheromones, called 2-phenoxyethanol.