Insecticide or a pesticide I believe.
Answer:
I would guess less than ten minutes ago, because in that amount of time the tissues in the soles of the feet will have begun to die, but gravity has not had long enough to pull all the blood down to the feet, thus resulting in discoloration.
Creosote can be found from the Edwards Plateau to the Rio Grande Plains, and into Mexico.
It’s the first answer choice :)
